1
|
Ren Z, Sun JJ, Xu L, Luo P, Ma ZW, Li S, Si YB, Dong XY, Pan F. X-ray-triggered through-space charge transfer and photochromism in silver nanoclusters. NANOSCALE 2024; 16:2662-2671. [PMID: 38230765 DOI: 10.1039/d3nr05409h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Materials exhibiting X-ray-induced photochromism have consistently piqued the interest of researchers. Exploring the photochromic properties of such materials is valuable for understanding the structural changes and electron transfer processes that occur under high energy radiation, such as X-ray irradiation. Here, a crystalline silver(I) nanocluster synthesized from tert-butylacetylene silver was found to have the ability to exhibit color and photoluminescence changes upon exposure to X-ray radiation. The responsive behavior was observed across a wide temperature range of 100-300 K, with the ability to respond particularly well to soft X-rays (λ > 1 Å) and exhibit light responsiveness to hard X-rays (λ < 1 Å). By combining experimental findings including X-ray diffraction, X-ray photoelectron spectroscopy, electron spin resonance, etc. with theoretical calculations, we have proposed that X-ray irradiation induces electron transfer from chloride (Cl-) located in the center of the silver(I) nanocluster to the surrounding Ag14 in the skeleton. This represents the first documented example in which electron transfer induced by X-ray excitation has been observed, accompanied by a photochromism process, in silver nanoclusters. This study contributes to our understanding of X-ray-induced photochromism and the electron transfer process in silver cluster compounds. It also provides valuable insights and potential design strategies for applications such as photochromism, photoluminescence color change, and photoenergy conversion.
Collapse
Affiliation(s)
- Zhen Ren
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China.
| | - Jun-Jun Sun
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China.
| | - Long Xu
- College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China.
| | - Peng Luo
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China.
| | - Zi-Wei Ma
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China.
| | - Si Li
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Yu-Bing Si
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Xi-Yan Dong
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China.
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Fangfang Pan
- College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China.
| |
Collapse
|
2
|
Deng L, Zhang W, Lin H, Xiang L, Xu Y, Wang Y, Li Q, Zhu Y, Zhou X, Wang W, Yin L, Guo H, Tian C, Shen J. Polarization-dependent photoinduced metal-insulator transitions in manganites. Sci Bull (Beijing) 2024; 69:183-189. [PMID: 38057234 DOI: 10.1016/j.scib.2023.11.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/10/2023] [Accepted: 11/23/2023] [Indexed: 12/08/2023]
Abstract
In correlated oxides, collaborative manipulation on light intensity, wavelength, pulse duration and polarization has yielded many exotic discoveries, such as phase transitions and novel quantum states. In view of potential optoelectronic applications, tailoring long-lived static properties by light-induced effects is highly desirable. So far, the polarization state of light has rarely been reported as a control parameter for this purpose. Here, we report polarization-dependent metal-to-insulator transition (MIT) in phase-separated manganite thin films, introducing a new degree of freedom to control static MIT. Specifically, we observed giant photoinduced resistance jumps with striking features: (1) a single resistance jump occurs upon a linearly polarized light incident with a chosen polarization angle, and a second resistance jump occurs when the polarization angle changes; (2) the amplitude of the second resistance jump depends sensitively on the actual change of the polarization angles. Linear transmittance measurements reveal that the origin of the above phenomena is closely related to the coexistence of anisotropic micro-domains. Our results represent a first step to utilize light polarization as an active knob to manipulate static phase transitions, pointing towards new pathways for nonvolatile optoelectronic devices and sensors.
Collapse
Affiliation(s)
- Lina Deng
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Weiye Zhang
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Hanxuan Lin
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Lifen Xiang
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Ying Xu
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yadi Wang
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Qiang Li
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yinyan Zhu
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China
| | - Xiaodong Zhou
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China
| | - Wenbin Wang
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China
| | - Lifeng Yin
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Shanghai Research Center for Quantum Sciences, Shanghai 201315, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Hangwen Guo
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China.
| | - Chuanshan Tian
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China.
| | - Jian Shen
- State Key Laboratory of Surface Physics, Institute for Nanoelectronic Devices and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200433, China; Shanghai Research Center for Quantum Sciences, Shanghai 201315, China; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China; Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai 201315, China.
| |
Collapse
|
3
|
Choi M, Jeon H, Eom K, Seo J, Roh S, Seo I, Oh SH, Hwang J, Lee Y, Pickett WE, Panagopoulos C, Eom CB, Lee J. Geometrical Doping at the Atomic Scale in Oxide Quantum Materials. ACS NANO 2023. [PMID: 37498093 DOI: 10.1021/acsnano.3c03038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Chemical dopants enabling a plethora of emergent physical properties have been treated as randomly and uniformly distributed in the frame of a three-dimensional doped system. However, in nanostructured architectures, the location of dopants relative to the interface or boundary can greatly influence device performance. This observation suggests that chemical dopants need to be considered as discrete defects, meaning that geometric control of chemical dopants becomes a critical aspect as the physical size of materials scales down into the nanotechnology regime. Here we show that geometrical control of dopants at the atomic scale is another fundamental parameter in chemical doping, extending beyond the kind and amount of dopants conventionally used. The geometrical control of dopants extends the class of geometrically controlled structures into an unexplored dimensionality, between 2D and 3D. It is well understood that in the middle of the progressive dimensionality change from 3D to 2D, the electronic state of doped SrTiO3 is altered from a highly symmetric charged fluid to a charge disproportionated insulating state. Our results introduce a geometrical control of dopants, namely, geometrical doping, as another axis to provide a variety of emergent electronic states via tuning of the electronic properties of the solid state.
Collapse
Affiliation(s)
- Minsu Choi
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- CompAID Research, Suwon 16419, Republic of Korea
| | - Hyunwoo Jeon
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Kitae Eom
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Jinsol Seo
- Department of Energy Engineering, Institute for Energy Materials and Devices, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
| | - Seulki Roh
- Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Ilwan Seo
- Department of Physics, Soongsil University, Seoul 06978, Republic of Korea
| | - Sang Ho Oh
- Department of Energy Engineering, Institute for Energy Materials and Devices, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
| | - Jungseek Hwang
- Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Yunsang Lee
- Department of Physics, Soongsil University, Seoul 06978, Republic of Korea
| | - Warren E Pickett
- Department of Physics, University of California Davis, Davis, California 95616, United States
| | - Christos Panagopoulos
- Division of Physics & Applied Physics, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 639798, Singapore
| | - Chang-Beom Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Jaichan Lee
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- CompAID Research, Suwon 16419, Republic of Korea
| |
Collapse
|
4
|
Zou Q, Wang GL, Chen YQ, Huang XD, Wen GH, Qin MF, Bao SS, Zhang YQ, Zheng LM. X-Ray Triggered Coordination-Bond Breakage in Dysprosium-Organic Framework and its Impact on Magnetic Properties. Chemistry 2023; 29:e202203454. [PMID: 36445817 DOI: 10.1002/chem.202203454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 11/29/2022] [Accepted: 11/29/2022] [Indexed: 11/30/2022]
Abstract
Photosensitive lanthanide-based single-molecule magnets (Ln-SMM) are very attractive for their potential applications in information storage, switching, and sensors. However, the light-driven structural transformation in Ln-SMMs hardly changes the coordination number of the lanthanide ion. Herein, for the first time it is reported that X-ray (λ=0.71073 Å) irradiation can break the coordination bond of Dy-OH2 in the three-dimensional (3D) metal-organic framework Dy2 (amp2 H2 )3 (H2 O)6 ⋅ 4H2 O (MDAF-5), in which the {Dy2 (OPO)2 } dimers are cross-linked by dianthracene-phosphonate ligands. The structural transformation proceeds in a single-crystal-to-single-crystal (SC-SC) fashion, forming the new phase Dy2 (amp2 H2 )3 (H2 O)4 ⋅ 4H2 O (MDAF-5-X). The phase transition is accompanied by a significant change in magnetic properties due to the alteration in coordination geometry of the DyIII ion from a distorted pentagonal bipyramid in MDAF-5 to a distorted octahedron in MDAF-5-X.
Collapse
Affiliation(s)
- Qian Zou
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Guo-Lu Wang
- Jiangsu Key Laboratory for NSLSCS School of Physical Science and Technology, Nanjing Normal University, Nanjing, 210023, P.R. China
| | - Yi-Qing Chen
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Xin-Da Huang
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Ge Hua Wen
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Ming-Feng Qin
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Song-Song Bao
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS School of Physical Science and Technology, Nanjing Normal University, Nanjing, 210023, P.R. China
| | - Li-Min Zheng
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210023, P.R. China
| |
Collapse
|
5
|
Sun YH, Li CL, Wang WF, Wang SH, Li PX, Guo GC. A photochromic and scintillation Eu-MOF with visual X-ray detection in bright and dark environments. Chem Commun (Camb) 2022; 58:4056-4059. [PMID: 35262118 DOI: 10.1039/d2cc00166g] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The detection of X-rays has always been a frontier of scientific research. An Eu-MOF with both X-ray-induced photochromic and scintillation properties has been synthesized through the combination of a photochromism-active viologen ligand and rare earth Eu element with high-efficiency absorption of X-rays. In a bright environment, Eu-MOF exhibits different color changes under high-energy X-rays and low-energy X-rays, which can effectively distinguish X-rays. Eu-MOF can also be used for X-ray detection by scintillation properties in dark environments. This work provides a new perspective on the design of multifunctional materials that can perform simple X-ray detection in different environments.
Collapse
Affiliation(s)
- Yu-He Sun
- College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, P. R. China.,State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Chun-Lei Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Wen-Fei Wang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Shuai-Hua Wang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Pei-Xin Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Guo-Cong Guo
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| |
Collapse
|
6
|
Bharti A, Turchet A, Marmiroli B. X-Ray Lithography for Nanofabrication: Is There a Future? FRONTIERS IN NANOTECHNOLOGY 2022. [DOI: 10.3389/fnano.2022.835701] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
X-ray lithography has been first proposed almost 50 years ago, and the related LIGA process around 25 years ago. It is therefore a good time to make an analysis of the technique, with its pros and cons. In this perspective article, we describe X-ray lithography’s latest advancements. First, we report the improvement in the fabrication of the high aspect ratio and high-resolution micro/nanostructures. Then, we present the radiation-assisted synthesis and processing of novel materials for the next generation of functional devices. We finally draw our conclusion on the future prospects of the technique.
Collapse
|
7
|
Bras W, Myles DAA, Felici R. When x-rays alter the course of your experiments. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:423002. [PMID: 34298526 DOI: 10.1088/1361-648x/ac1767] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
The continuing increase in the brilliance of synchrotron radiation beamlines allows for many new and exciting experiments that were impossible before the present generation of synchrotron radiation sources came on line. However, the exposure to such intense beams also tests the limits of what samples can endure. Whilst the effects of radiation induced damage in a static experiment often can easily be recognized by changes in the diffraction or spectroscopy curves, the influence of radiation on chemical or physical processes, where one expects curves to change, is less often recognized and can be misinterpreted as a 'real' result instead of as a 'radiation influenced result'. This is especially a concern in time-resolved materials science experiments using techniques as powder diffraction, small angle scattering and x-ray absorption spectroscopy. Here, the effects of radiation (5-50 keV) on some time-resolved processes in different types of materials and in different physical states are discussed. We show that such effects are not limited to soft matter and biology but rather can be found across the whole spectrum of materials research, over a large range of radiation doses and is not limited to very high brilliance beamlines.
Collapse
Affiliation(s)
- Wim Bras
- Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge TN 37831, United States of America
| | - Dean A A Myles
- Neutron Scattering Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge TN 37831, United States of America
| | - Roberto Felici
- CNR-SPIN, Area della ricerca di Tor Vergata, via del Fosso del Cavaliere 100, 00133 Roma, Italy
| |
Collapse
|
8
|
Coates CS, Murray CA, Boström HLB, Reynolds EM, Goodwin AL. Negative X-ray expansion in cadmium cyanide. MATERIALS HORIZONS 2021; 8:1446-1453. [PMID: 34846452 PMCID: PMC8111741 DOI: 10.1039/d0mh01989e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/12/2021] [Indexed: 06/12/2023]
Abstract
Cadmium cyanide, Cd(CN)2, is a flexible coordination polymer best studied for its strong and isotropic negative thermal expansion (NTE) effect. Here we show that this NTE is actually X-ray-exposure dependent: Cd(CN)2 contracts not only on heating but also on irradiation by X-rays. This behaviour contrasts that observed in other beam-sensitive materials, for which X-ray exposure drives lattice expansion. We call this effect 'negative X-ray expansion' (NXE) and suggest its origin involves an interaction between X-rays and cyanide 'flips'; in particular, we rule out local heating as a possible mechanism. Irradiation also affects the nature of a low-temperature phase transition. Our analysis resolves discrepancies in NTE coefficients reported previously on the basis of X-ray diffraction measurements, and we establish the 'true' NTE behaviour of Cd(CN)2 across the temperature range 150-750 K. The interplay between irradiation and mechanical response in Cd(CN)2 highlights the potential for exploiting X-ray exposure in the design of functional materials.
Collapse
Affiliation(s)
- Chloe S. Coates
- Inorganic Chemistry Laboratory, South Parks RoadOxfordOX1 3QRUK+44 1865 272137
- Department of Chemistry, Lensfield RoadCambridgeUK
| | - Claire A. Murray
- Diamond Light Source, Harwell CampusDidcotOxfordshire OX11 0DEUK
| | - Hanna L. B. Boström
- Inorganic Chemistry Laboratory, South Parks RoadOxfordOX1 3QRUK+44 1865 272137
- Nanochemistry Department, Max Planck Institute for Solid State Research, Heisenbergstr. 1Stuttgart70569Germany
| | - Emily M. Reynolds
- Inorganic Chemistry Laboratory, South Parks RoadOxfordOX1 3QRUK+44 1865 272137
- ISIS Facility, STFC Rutherford Appleton LaboratoryDidcotOxfordshire OX11 0QXUK
| | - Andrew L. Goodwin
- Inorganic Chemistry Laboratory, South Parks RoadOxfordOX1 3QRUK+44 1865 272137
| |
Collapse
|
9
|
Smari M, Hamdi R, Prado-Gonjal J, Cortés-Gil R, Dhahri E, Mompean F, García-Hernández M, Schmidt R. Magnetoimpedance spectroscopy of phase-separated La 0.5Ca 0.5MnO 3 polycrystalline manganites. Phys Chem Chem Phys 2020; 22:11625-11636. [PMID: 32405632 DOI: 10.1039/d0cp00794c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetoimpedance spectroscopy was carried out on phase-separated La0.5Ca0.5MnO3 polycrystalline manganites. The La0.5Ca0.5MnO3 powder was synthesized following an adapted sol-gel route. Structural and magnetic data showed the signs of phase coexistence of ferromagnetic (FM) Pnma and charge-ordered antiferromagnetic (CO-AFM) P21/m phases. Magnetization vs. temperature (M vs. T) measurements revealed several magnetic transitions from the high temperature paramagnetic (PM) to an FM phase upon cooling (PM-FM) at ≈240 K, FM-AFM (≈170 K) and AFM-FM (≈100 K). Magnetic field (H)-dependent impedance spectroscopy data were collected from sintered pellets and fitted with an equivalent circuit model to separately analyze the different dielectric contributions from the grain boundary (GB) and the grain interior bulk areas. This allowed separating the GB and bulk magnetoresistance (MR), which was shown to amount to a maximum of ≈80% for both GB and bulk at H = 10 T near the metal-insulator transition (MIT) at ≈100 K. The GB resistance was found to be larger than the bulk resistance by a factor of ≈3, which implies that the direct current (DC) resistance and DC MR are dominated by contributions from the GBs. The magnetocapacitance (MC) effects detected were all found to be small below ≈3%, including in the presence of a CO phase.
Collapse
Affiliation(s)
- Mourad Smari
- CICECO, Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Li J, Wang R, Guo H, Zhu Y, Cao Y, Liu J, Ding H, Wen H, Liu X. Recovery of photoexcited magnetic ordering in Sr 2IrO 4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:255801. [PMID: 30897558 DOI: 10.1088/1361-648x/ab123d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The recovery of antiferromagnetic and lattice order of Sr2IrO4 upon laser excitation was measured by time-resolved x-ray diffraction on nanosecond time scales. The in situ measurements of both magnetic and lattice order parameters allow direct comparison of their time evolutions without ambiguity. We found that the magnetic order recovers with two time constants. The fast sub-nanosecond recovery is associated with the re-establishment of three dimensional antiferromagnetic order while the slow sub-nanosecond recovery agrees with the lattice cooling on tens of nanoseconds. The strong oscillating behavior of magnetic order during the long time recovery may be related to complicated dynamics of defect-pinned magnetic domains.
Collapse
Affiliation(s)
- Jiemin Li
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physics, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Feng Q, Jin F, Zhou H, Wang L, Meng W, Zhang K, Wang J, Zhang J, Hou Y, Lu Q, Wu W. Induced Formation of Structural Domain Walls and Their Confinement on Phase Dynamics in Strained Manganite Thin Films. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1805353. [PMID: 30370644 DOI: 10.1002/adma.201805353] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 09/23/2018] [Indexed: 06/08/2023]
Abstract
Domain walls (DWs) in strongly correlated materials have provided fertile ground for the discovery of exotic phenomena, and controlling the formation of DWs is still a challenge. Here, it is demonstrated that a new type of structural DW can be induced in a series of manganite thin films, which are engineered to achieve a robust charge-ordering insulating (COI) ground state by selecting various films and substrates. The monoclinic domains are somewhat irregular in shape, and the corresponding DWs, taking the shape of closed loops, are ferromagnetic and metallic (FMM) at low temperatures. Remarkably, the DWs exhibit little dependence on temperature or magnetic field, due to the structural origins of the domains. Additionally, using magnetic force microscopy, the role played by DWs in the dynamics of the COI and FMM phases at the mesoscopic scale is revealed. They function as barriers, strictly confining the phase dynamics within each domain, reflecting the strong coupling of electronic phases with the lattice. Each domain exhibits binary occupation by a single pure phase, resulting in a quasi-periodic phase separation. The universal behaviors of the multiple engineered films elucidate the possibility of controlling the formation of DWs and tuning phase dynamics through DW design.
Collapse
Affiliation(s)
- Qiyuan Feng
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Feng Jin
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Haibiao Zhou
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Lingfei Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Wenjie Meng
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
| | - Kexuan Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Jihao Wang
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
| | - Jing Zhang
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
| | - Yubin Hou
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
| | - Qingyou Lu
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Wenbin Wu
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
- Hefei Science Center, Chinese Academy of Sciences, Hefei, 230031, China
- Institute of Physical Science and Information Technology, Anhui University, Hefei, 230601, China
| |
Collapse
|
12
|
Kim MG, Miao H, Gao B, Cheong SW, Mazzoli C, Barbour A, Hu W, Wilkins SB, Robinson IK, Dean MPM, Kiryukhin V. Imaging antiferromagnetic antiphase domain boundaries using magnetic Bragg diffraction phase contrast. Nat Commun 2018; 9:5013. [PMID: 30479333 PMCID: PMC6258669 DOI: 10.1038/s41467-018-07350-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/24/2018] [Indexed: 11/09/2022] Open
Abstract
Manipulating magnetic domains is essential for many technological applications. Recent breakthroughs in Antiferromagnetic Spintronics brought up novel concepts for electronic device development. Imaging antiferromagnetic domains is of key importance to this field. Unfortunately, some of the basic domain types, such as antiphase domains, cannot be imaged by conventional techniques. Herein, we present a new domain projection imaging technique based on the localization of domain boundaries by resonant magnetic diffraction of coherent X rays. Contrast arises from reduction of the scattered intensity at the domain boundaries due to destructive interference effects. We demonstrate this approach by imaging antiphase domains in a collinear antiferromagnet Fe2Mo3O8, and observe evidence of domain wall interaction with a structural defect. This technique does not involve any numerical algorithms. It is fast, sensitive, produces large-scale images in a single-exposure measurement, and is applicable to a variety of magnetic domain types. Imaging the antiferromagnetic (AFM) domains facilitates the understanding and design of AFM spintronics but is still challenging. Here the authors show an imaging approach for antiphase domains in AFM Fe2Mo3O8 by resonantly scattered coherent soft X-rays, which is also applicable to collinear antiferromagnets.
Collapse
Affiliation(s)
- Min Gyu Kim
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - Hu Miao
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Bin Gao
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - S-W Cheong
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - C Mazzoli
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - A Barbour
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Wen Hu
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - S B Wilkins
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - I K Robinson
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - M P M Dean
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - V Kiryukhin
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA.
| |
Collapse
|
13
|
Lin H, Liu H, Lin L, Dong S, Chen H, Bai Y, Miao T, Yu Y, Yu W, Tang J, Zhu Y, Kou Y, Niu J, Cheng Z, Xiao J, Wang W, Dagotto E, Yin L, Shen J. Unexpected Intermediate State Photoinduced in the Metal-Insulator Transition of Submicrometer Phase-Separated Manganites. PHYSICAL REVIEW LETTERS 2018; 120:267202. [PMID: 30004745 DOI: 10.1103/physrevlett.120.267202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/09/2018] [Indexed: 06/08/2023]
Abstract
At ultrafast timescales, the initial and final states of a first-order metal-insulator transition often coexist forming clusters of the two phases. Here, we report an unexpected third long-lived intermediate state emerging at the photoinduced first-order metal-insulator transition of La_{0.325}Pr_{0.3}Ca_{0.375}MnO_{3}, known to display submicrometer length-scale phase separation. Using magnetic force microscopy and time-dependent magneto-optical Kerr effect, we determined that the third state is a nanoscale mixture of the competing ferromagnetic metallic and charge-ordered insulating phases, with its own physical properties. This discovery bridges the two different families of colossal magnetoresistant manganites known experimentally and shows for the first time that the associated states predicted by theory can coexist in a single sample.
Collapse
Affiliation(s)
- Hanxuan Lin
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Hao Liu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Lingfang Lin
- School of Physics, Southeast University, Nanjing 211189, China
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing 211189, China
| | - Hongyan Chen
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yu Bai
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Tian Miao
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yang Yu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Weichao Yu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Jing Tang
- Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yinyan Zhu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yunfang Kou
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Jiebin Niu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Zhaohua Cheng
- Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Jiang Xiao
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Wenbin Wang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Elbio Dagotto
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Lifeng Yin
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Jian Shen
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| |
Collapse
|
14
|
VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy. CONDENSED MATTER 2018. [DOI: 10.3390/condmat3010006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
15
|
Guo PY, Sun C, Zhang NN, Cai LZ, Wang MS, Guo GC. An inorganic–organic hybrid photochromic material with fast response to hard and soft X-rays at room temperature. Chem Commun (Camb) 2018. [DOI: 10.1039/c8cc00694f] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first X-ray-induced photochromic material, with the coloration time being within 5 min when exposed to Mo-Kα and Al-Kα X-rays, was designed and synthesized.
Collapse
Affiliation(s)
- Pei-Yu Guo
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Cai Sun
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Ning-Ning Zhang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Li-Zhen Cai
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Ming-Sheng Wang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Guo-Cong Guo
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| |
Collapse
|
16
|
Basov DN, Averitt RD, Hsieh D. Towards properties on demand in quantum materials. NATURE MATERIALS 2017; 16:1077-1088. [PMID: 29066824 DOI: 10.1038/nmat5017] [Citation(s) in RCA: 197] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 09/22/2017] [Indexed: 05/21/2023]
Abstract
The past decade has witnessed an explosion in the field of quantum materials, headlined by the predictions and discoveries of novel Landau-symmetry-broken phases in correlated electron systems, topological phases in systems with strong spin-orbit coupling, and ultra-manipulable materials platforms based on two-dimensional van der Waals crystals. Discovering pathways to experimentally realize quantum phases of matter and exert control over their properties is a central goal of modern condensed-matter physics, which holds promise for a new generation of electronic/photonic devices with currently inaccessible and likely unimaginable functionalities. In this Review, we describe emerging strategies for selectively perturbing microscopic interaction parameters, which can be used to transform materials into a desired quantum state. Particular emphasis will be placed on recent successes to tailor electronic interaction parameters through the application of intense fields, impulsive electromagnetic stimulation, and nanostructuring or interface engineering. Together these approaches outline a potential roadmap to an era of quantum phenomena on demand.
Collapse
Affiliation(s)
- D N Basov
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - R D Averitt
- Department of Physics, University of California San Diego, La Jolla, California 92093, USA
| | - D Hsieh
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
| |
Collapse
|
17
|
Chen C, Sun JK, Zhang YJ, Yang XD, Zhang J. Flexible Viologen-Based Porous Framework Showing X-ray Induced Photochromism with Single-Crystal-to-Single-Crystal Transformation. Angew Chem Int Ed Engl 2017; 56:14458-14462. [DOI: 10.1002/anie.201707290] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Indexed: 01/01/2023]
Affiliation(s)
- Cheng Chen
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Jian-Ke Sun
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
- Current address: Department of Colloid Chemistry; Max Planck Institute of Colloids and Interfaces; Research Campus Golm 14476 Potsdam Germany
| | - Ya-Jun Zhang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Xiao-Dong Yang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Jie Zhang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
- MOE Key Laboratory of Cluster Science; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 102488 P.R. China
| |
Collapse
|
18
|
Chen C, Sun JK, Zhang YJ, Yang XD, Zhang J. Flexible Viologen-Based Porous Framework Showing X-ray Induced Photochromism with Single-Crystal-to-Single-Crystal Transformation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707290] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Cheng Chen
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Jian-Ke Sun
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
- Current address: Department of Colloid Chemistry; Max Planck Institute of Colloids and Interfaces; Research Campus Golm 14476 Potsdam Germany
| | - Ya-Jun Zhang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Xiao-Dong Yang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
| | - Jie Zhang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter, CAS; Fuzhou Fujian 350002 P. R. China
- MOE Key Laboratory of Cluster Science; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 102488 P.R. China
| |
Collapse
|
19
|
Eom K, Choi E, Yoon J, Choi M, Song K, Choi SY, Lee D, Lee JW, Eom CB, Lee J. Electron-Lattice Coupling in Correlated Materials of Low Electron Occupancy. NANO LETTERS 2017; 17:5458-5463. [PMID: 28850246 DOI: 10.1021/acs.nanolett.7b02109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In correlated materials including transition metal oxides, electronic properties and functionalities are modulated and enriched by couplings between the electron and lattice degrees of freedom. These couplings are controlled by external parameters such as chemical doping, pressure, magnetic and electric fields, and light irradiation. However, the electron-lattice coupling relies on orbital characters, i.e., symmetry and occupancy, of t2g and eg orbitals, so that a large electron-lattice coupling is limited to eg electron system, whereas t2g electron system exhibits an inherently weak coupling. Here, we design and demonstrate a strongly enhanced electron-lattice coupling in electron-doped SrTiO3, that is, the t2g electron system. In ultrathin films of electron-doped SrTiO3 [i.e., (La0.25Sr0.75)TiO3], we reveal the strong electron-lattice-orbital coupling, which is manifested by extremely increased tetragonality and the corresponding metal-to-insulator transition. Our findings open the way of an active tuning of the charge-lattice-orbital coupling to obtain new functionalities relevant to emerging nanoelectronic devices.
Collapse
Affiliation(s)
- Kitae Eom
- School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| | - Euiyoung Choi
- School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| | - Jonghyun Yoon
- School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| | - Minsu Choi
- School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| | - Kyung Song
- Department of Materials Modeling and Characterization, Korea Institute of Materials Science , Changwon 51508, Republic of Korea
| | - Si-Young Choi
- Department of Materials Modeling and Characterization, Korea Institute of Materials Science , Changwon 51508, Republic of Korea
| | - Daesu Lee
- Department of Materials Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53792, United States
| | - Jung-Woo Lee
- Department of Materials Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53792, United States
| | - Chang-Beom Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53792, United States
| | - Jaichan Lee
- School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| |
Collapse
|
20
|
Liu M, Sternbach AJ, Basov DN. Nanoscale electrodynamics of strongly correlated quantum materials. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:014501. [PMID: 27811387 DOI: 10.1088/0034-4885/80/1/014501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electronic, magnetic, and structural phase inhomogeneities are ubiquitous in strongly correlated quantum materials. The characteristic length scales of the phase inhomogeneities can range from atomic to mesoscopic, depending on their microscopic origins as well as various sample dependent factors. Therefore, progress with the understanding of correlated phenomena critically depends on the experimental techniques suitable to provide appropriate spatial resolution. This requirement is difficult to meet for some of the most informative methods in condensed matter physics, including infrared and optical spectroscopy. Yet, recent developments in near-field optics and imaging enabled a detailed characterization of the electromagnetic response with a spatial resolution down to 10 nm. Thus it is now feasible to exploit at the nanoscale well-established capabilities of optical methods for characterization of electronic processes and lattice dynamics in diverse classes of correlated quantum systems. This review offers a concise description of the state-of-the-art near-field techniques applied to prototypical correlated quantum materials. We also discuss complementary microscopic and spectroscopic methods which reveal important mesoscopic dynamics of quantum materials at different energy scales.
Collapse
Affiliation(s)
- Mengkun Liu
- Department of Physics, Stony Brook University, Stony Brook, NY 11794, USA
| | | | | |
Collapse
|
21
|
Liang HW, Kroll T, Nordlund D, Weng TC, Sokaras D, Pierpont CG, Gaffney KJ. Charge and Spin-State Characterization of Cobalt Bis(o-dioxolene) Valence Tautomers Using Co Kβ X-ray Emission and L-Edge X-ray Absorption Spectroscopies. Inorg Chem 2016; 56:737-747. [DOI: 10.1021/acs.inorgchem.6b01666] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Winnie Liang
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Thomas Kroll
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Tsu-Chien Weng
- Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, P. R. China
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Cortlandt G. Pierpont
- Department
of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
| | - Kelly J. Gaffney
- PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| |
Collapse
|
22
|
Mattoni G, Zubko P, Maccherozzi F, van der Torren AJH, Boltje DB, Hadjimichael M, Manca N, Catalano S, Gibert M, Liu Y, Aarts J, Triscone JM, Dhesi SS, Caviglia AD. Striped nanoscale phase separation at the metal-insulator transition of heteroepitaxial nickelates. Nat Commun 2016; 7:13141. [PMID: 27804954 PMCID: PMC5097133 DOI: 10.1038/ncomms13141] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 09/07/2016] [Indexed: 11/12/2022] Open
Abstract
Nucleation processes of mixed-phase states are an intrinsic characteristic of first-order phase transitions, typically related to local symmetry breaking. Direct observation of emerging mixed-phase regions in materials showing a first-order metal–insulator transition (MIT) offers unique opportunities to uncover their driving mechanism. Using photoemission electron microscopy, we image the nanoscale formation and growth of insulating domains across the temperature-driven MIT in NdNiO3 epitaxial thin films. Heteroepitaxy is found to strongly determine the nanoscale nature of the phase transition, inducing preferential formation of striped domains along the terraces of atomically flat stepped surfaces. We show that the distribution of transition temperatures is a local property, set by surface morphology and stable across multiple temperature cycles. Our data provide new insights into the MIT of heteroepitaxial nickelates and point to a rich, nanoscale phenomenology in this strongly correlated material. Probing the evolution of mixed-phase states in materials offers unique insights into the microscopic mechanism of phase transitions. Here, Mattoni et al. report imaging of nanoscale formation and growth of insulating domains across the metal-insulator transition in NdNiO3 thin films, uncovering a rich interplay between structural and electronic degrees of freedom.
Collapse
Affiliation(s)
- G Mattoni
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands
| | - P Zubko
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0HA, UK
| | - F Maccherozzi
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton OX11 0DE, UK
| | - A J H van der Torren
- Kamerlingh Onnes-Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands
| | - D B Boltje
- Kamerlingh Onnes-Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands
| | - M Hadjimichael
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0HA, UK
| | - N Manca
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands
| | - S Catalano
- Département de Physique de la Matière Quantique, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - M Gibert
- Département de Physique de la Matière Quantique, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - Y Liu
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton OX11 0DE, UK
| | - J Aarts
- Kamerlingh Onnes-Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands
| | - J-M Triscone
- Département de Physique de la Matière Quantique, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - S S Dhesi
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton OX11 0DE, UK
| | - A D Caviglia
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands
| |
Collapse
|
23
|
Zhang J, Tan X, Liu M, Teitelbaum SW, Post KW, Jin F, Nelson KA, Basov DN, Wu W, Averitt RD. Cooperative photoinduced metastable phase control in strained manganite films. NATURE MATERIALS 2016; 15:956-960. [PMID: 27400387 DOI: 10.1038/nmat4695] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 06/10/2016] [Indexed: 06/06/2023]
Abstract
A major challenge in condensed-matter physics is active control of quantum phases. Dynamic control with pulsed electromagnetic fields can overcome energetic barriers, enabling access to transient or metastable states that are not thermally accessible. Here we demonstrate strain-engineered tuning of La2/3Ca1/3MnO3 into an emergent charge-ordered insulating phase with extreme photo-susceptibility, where even a single optical pulse can initiate a transition to a long-lived metastable hidden metallic phase. Comprehensive single-shot pulsed excitation measurements demonstrate that the transition is cooperative and ultrafast, requiring a critical absorbed photon density to activate local charge excitations that mediate magnetic-lattice coupling that, in turn, stabilize the metallic phase. These results reveal that strain engineering can tune emergent functionality towards proximal macroscopic states to enable dynamic ultrafast optical phase switching and control.
Collapse
Affiliation(s)
- Jingdi Zhang
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
- Department of Physics, Boston University, Boston, Massachusetts 02215, USA
| | - Xuelian Tan
- Hefei National Laboratory for Physical Sciences at Microscale, and High Magnetic Field Laboratory of Chinese Academy of Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Mengkun Liu
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
- Department of Physics, Stony Brook University, Stony Brook, New York 11790, USA
| | - S W Teitelbaum
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - K W Post
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
| | - Feng Jin
- Hefei National Laboratory for Physical Sciences at Microscale, and High Magnetic Field Laboratory of Chinese Academy of Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - K A Nelson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - D N Basov
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
| | - Wenbin Wu
- Hefei National Laboratory for Physical Sciences at Microscale, and High Magnetic Field Laboratory of Chinese Academy of Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
- Collaborative Innovation Center of Advanced Microstructure, Nanjing 210093, China
| | - R D Averitt
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
- Department of Physics, Boston University, Boston, Massachusetts 02215, USA
| |
Collapse
|
24
|
Mankowsky R, Först M, Cavalleri A. Non-equilibrium control of complex solids by nonlinear phononics. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:064503. [PMID: 27223639 DOI: 10.1088/0034-4885/79/6/064503] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We review some recent advances in the use of optical fields at terahertz frequencies to drive the lattice of complex materials. We will focus on the control of low energy collective properties of solids, which emerge on average when a high frequency vibration is driven and a new crystal structure induced. We first discuss the fundamentals of these lattice rearrangements, based on how anharmonic mode coupling transforms an oscillatory motion into a quasi-static deformation of the crystal structure. We then discuss experiments, in which selectively changing a bond angle turns an insulator into a metal, accompanied by changes in charge, orbital and magnetic order. We then address the case of light induced non-equilibrium superconductivity, a mysterious phenomenon observed in some cuprates and molecular materials when certain lattice vibrations are driven. Finally, we show that the dynamics of electronic and magnetic phase transitions in complex-oxide heterostructures follow distinctly new physical pathways in case of the resonant excitation of a substrate vibrational mode.
Collapse
Affiliation(s)
- Roman Mankowsky
- Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
| | | | | |
Collapse
|
25
|
Truccato M, Agostino A, Borfecchia E, Mino L, Cara E, Pagliero A, Adhlakha N, Pascale L, Operti L, Enrico E, De Leo N, Fretto M, Martinez-Criado G, Lamberti C. Direct-Write X-ray Nanopatterning: A Proof of Concept Josephson Device on Bi2Sr2CaCu2O8+δ Superconducting Oxide. NANO LETTERS 2016; 16:1669-1674. [PMID: 26814601 DOI: 10.1021/acs.nanolett.5b04568] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We describe the first use of a novel photoresist-free X-ray nanopatterning technique to fabricate an electronic device. We have produced a proof-of-concept device consisting of a few Josephson junctions by irradiating microcrystals of the Bi2Sr2CaCu2O8+δ (Bi-2212) superconducting oxide with a 17.6 keV synchrotron nanobeam. Fully functional devices have been obtained by locally turning the material into a nonsuperconducting state by means of hard X-ray exposure. Nano-XRD patterns reveal that the crystallinity is substantially preserved in the irradiated areas that there is no evidence of macroscopic crystal disruption. Indications are that O ions have been removed from the crystals, which could make this technique interesting also for other oxide materials. Direct-write X-ray nanopatterning represents a promising fabrication method exploiting material/material rather than vacuum/material interfaces, with the potential for nanometric resolution, improved mechanical stability, enhanced depth of patterning, and absence of chemical contamination with respect to traditional lithographic techniques.
Collapse
Affiliation(s)
- Marco Truccato
- Department of Physics, Interdepartmental Centre NIS, University of Torino , via Giuria 1, I-10125 Torino, Italy
| | - Angelo Agostino
- Department of Chemistry, Interdepartmental Centre NIS and INSTM Centro di Riferimento, University of Torino , via Giuria 7, I-10125 Torino, Italy
| | - Elisa Borfecchia
- Department of Chemistry, Interdepartmental Centre NIS and INSTM Centro di Riferimento, University of Torino , via Giuria 7, I-10125 Torino, Italy
| | - Lorenzo Mino
- INRIM, National Institute for Metrological Research , Strada delle Cacce 91, I-10135 Torino, Italy
| | - Eleonora Cara
- Department of Physics, Interdepartmental Centre NIS, University of Torino , via Giuria 1, I-10125 Torino, Italy
| | - Alessandro Pagliero
- Department of Physics, Interdepartmental Centre NIS, University of Torino , via Giuria 1, I-10125 Torino, Italy
| | - Nidhi Adhlakha
- Department of Physics, Interdepartmental Centre NIS, University of Torino , via Giuria 1, I-10125 Torino, Italy
| | - Lise Pascale
- Department of Chemistry, Interdepartmental Centre NIS and INSTM Centro di Riferimento, University of Torino , via Giuria 7, I-10125 Torino, Italy
| | - Lorenza Operti
- Department of Chemistry, Interdepartmental Centre NIS and INSTM Centro di Riferimento, University of Torino , via Giuria 7, I-10125 Torino, Italy
| | - Emanuele Enrico
- INRIM, National Institute for Metrological Research , Strada delle Cacce 91, I-10135 Torino, Italy
| | - Natascia De Leo
- INRIM, National Institute for Metrological Research , Strada delle Cacce 91, I-10135 Torino, Italy
| | - Matteo Fretto
- INRIM, National Institute for Metrological Research , Strada delle Cacce 91, I-10135 Torino, Italy
| | - Gema Martinez-Criado
- Experiments Division, European Synchrotron Radiation Facility , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Carlo Lamberti
- Department of Chemistry, Interdepartmental Centre NIS and INSTM Centro di Riferimento, University of Torino , via Giuria 7, I-10125 Torino, Italy
- Southern Federal University , Zorge Street 5, 344090 Rostov-on-Don, Russia
| |
Collapse
|
26
|
Hattori AN, Fujiwara Y, Fujiwara K, Nguyen TVA, Nakamura T, Ichimiya M, Ashida M, Tanaka H. Identification of Giant Mott Phase Transition of Single Electric Nanodomain in Manganite Nanowall Wire. NANO LETTERS 2015; 15:4322-8. [PMID: 26007707 DOI: 10.1021/acs.nanolett.5b00264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the scaling down of electronic devices, functional oxides with strongly correlated electron system provide advantages to conventional semiconductors, namely, huge switching owing to their phase transition and high carrier density, which guarantee their rich functionalities even at the 10 nm scale. However, understanding how their functionalities behave at a scale of 10 nm order is still a challenging issue. Here, we report the construction of the well-defined (La,Pr,Ca)MnO3 epitaxial oxide nanowall wire by combination of nanolithography and subsequent thin-film growth, which allows the direct investigation of its insulator-metal transition (IMT) at the single domain scale. We show that the width of a (La,Pr,Ca)MnO3 nanowall sample can be reduced to 50 nm, which is smaller than the observed 70-200 nm-size electronic domains, and that a single electronic nanodomain in (La,Pr,Ca)MnO3 exhibited an intrinsic first-order IMT with an unusually steep single-step change in its magnetoresistance and temperature-induced resistance due to the domains arrangement in series. A simple model of the first-order transition for single electric domains satisfactorily illustrates the IMT behavior from macroscale down to the nanoscale.
Collapse
Affiliation(s)
- Azusa N Hattori
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| | - Yasushi Fujiwara
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| | - Kohei Fujiwara
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| | - Thi Van Anh Nguyen
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| | - Takuro Nakamura
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| | - Masayoshi Ichimiya
- ‡Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
- §School of Engineering, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan
| | - Masaaki Ashida
- ‡Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
| | - Hidekazu Tanaka
- †Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
| |
Collapse
|
27
|
Först M, Mankowsky R, Cavalleri A. Mode-selective control of the crystal lattice. Acc Chem Res 2015; 48:380-7. [PMID: 25594102 DOI: 10.1021/ar500391x] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
CONSPECTUS: Driving phase changes by selective optical excitation of specific vibrational modes in molecular and condensed phase systems has long been a grand goal for laser science. However, phase control has to date primarily been achieved by using coherent light fields generated by femtosecond pulsed lasers at near-infrared or visible wavelengths. This field is now being advanced by progress in generating intense femtosecond pulses in the mid-infrared, which can be tuned into resonance with infrared-active crystal lattice modes of a solid. Selective vibrational excitation is particularly interesting in complex oxides with strong electronic correlations, where even subtle modulations of the crystallographic structure can lead to colossal changes of the electronic and magnetic properties. In this Account, we summarize recent efforts to control the collective phase state in solids through mode-selective lattice excitation. The key aspect of the underlying physics is the nonlinear coupling of the resonantly driven phonon to other (Raman-active) modes due to lattice anharmonicities, theoretically discussed as ionic Raman scattering in the 1970s. Such nonlinear phononic excitation leads to rectification of a directly excited infrared-active mode and to a net displacement of the crystal along the coordinate of all anharmonically coupled modes. We present the theoretical basis and the experimental demonstration of this phenomenon, using femtosecond optical spectroscopy and ultrafast X-ray diffraction at a free electron laser. The observed nonlinear lattice dynamics is shown to drive electronic and magnetic phase transitions in many complex oxides, including insulator-metal transitions, charge/orbital order melting and magnetic switching in manganites. Furthermore, we show that the selective vibrational excitation can drive high-TC cuprates into a transient structure with enhanced superconductivity. The combination of nonlinear phononics with ultrafast crystallography at X-ray free electron lasers may provide new design rules for the development of materials that exhibit these exotic behaviors also at equilibrium.
Collapse
Affiliation(s)
- M. Först
- Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany
- Center for Free Electron Laser Science, Hamburg 22761, Germany
| | - R. Mankowsky
- Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany
- Center for Free Electron Laser Science, Hamburg 22761, Germany
| | - A. Cavalleri
- Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany
- Center for Free Electron Laser Science, Hamburg 22761, Germany
- Department of Physics, Oxford University, Clarendon Laboratory, Oxford OX1 3PU, U.K
| |
Collapse
|
28
|
Thiessen A, Beyreuther E, Werner R, Kleiner R, Koelle D, Eng LM. Conductivity and magnetoresistance of La0.7Ce0.3MnO(3-δ) thin films under photoexcitation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:025503. [PMID: 25531984 DOI: 10.1088/0953-8984/27/2/025503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
La0.7Ce0.3MnO3 thin films of different thicknesses, degrees of CeO2-phase segregation and oxygen deficiency, grown on SrTiO3 single crystal substrates, were comparatively investigated with respect to both their spectral and temperature-dependent photoconductivity (PC) and their magnetoresistance (MR) behaviour under photoexcitation. While as-grown films were insensitive to optical excitation, oxygen reduction appeared to be an effective way to decrease the film resistance, but the film thickness was found to play a minor role. However, from the evaluation of the spectral behaviour of the PC and the comparison of the MR of the LCeMO/substrate-samples with a bare substrate under illumination we find that the photoconductivity data reflects not only contributions from (i) photogenerated charge carriers in the film and (ii) carriers injected from the photoconductive substrate (as concluded from earlier works), but also (iii) a decisive parallel photoconduction in the SrTiO3 substrate. Furthermore--also by analyzing the MR characteristics--the unexpected occurence of a strong electroresistive effect in the sample with the highest degree of CeO2 segregation and oxygen deficiency could be attributed to the electroresistance of the SrTiO3 substrate as well. The results suggest a critical reconsideration and possibly a reinterpretation of several previous photoconductivity and electroresistance investigations of manganite thin films on SrTiO3.
Collapse
Affiliation(s)
- A Thiessen
- Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | | | | | | | | | | |
Collapse
|
29
|
Zhang H, Ming F, Kim HJ, Zhu H, Zhang Q, Weitering HH, Xiao X, Zeng C, Cho JH, Zhang Z. Stabilization and manipulation of electronically phase-separated ground states in defective indium atom wires on silicon. PHYSICAL REVIEW LETTERS 2014; 113:196802. [PMID: 25415916 DOI: 10.1103/physrevlett.113.196802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2014] [Indexed: 06/04/2023]
Abstract
Exploration and manipulation of electronic states in low-dimensional systems are of great importance in the fundamental and practical aspects of nanomaterial and nanotechnology. Here, we demonstrate that the incorporation of vacancy defects into monatomic indium wires on n-type Si(111) can stabilize electronically phase-separated ground states where the insulating 8×2 and metallic 4×1 phases coexist. Furthermore, the areal ratio of the two phases in the phase-separated states can be tuned reversibly by electric field or charge doping, and such tunabilities can be quantitatively captured by first principles-based modeling and simulations. The present results extend the realm of electronic phase separation from strongly correlated d-electron materials typically in bulk form to weakly interacting sp-electron systems in reduced dimensionality.
Collapse
Affiliation(s)
- Hui Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale (HFNL) and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Fangfei Ming
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territory, Hong Kong, China
| | - Hyun-Jung Kim
- Department of Physics, Hanyang University, 17 Haengdang-Dong, SeongDong-Ku, Seoul 133-791, Korea
| | - Hongbin Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale (HFNL) and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qiang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale (HFNL) and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hanno H Weitering
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Xudong Xiao
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territory, Hong Kong, China and Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen 518055, China
| | - Changgan Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale (HFNL) and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China and International Center for Quantum Design of Functional Materials (ICQD), HFNL, University of Science and Technology of China, Hefei, Anhui 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jun-Hyung Cho
- Department of Physics, Hanyang University, 17 Haengdang-Dong, SeongDong-Ku, Seoul 133-791, Korea
| | - Zhenyu Zhang
- International Center for Quantum Design of Functional Materials (ICQD), HFNL, University of Science and Technology of China, Hefei, Anhui 230026, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| |
Collapse
|
30
|
Wu J, Tao C, Li Y, Yan Y, Li J, Yu J. Methylviologen-templated layered bimetal phosphate: a multifunctional X-ray-induced photochromic material. Chem Sci 2014. [DOI: 10.1039/c4sc01396d] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
31
|
Chang SH, Kim J, Phatak C, D'Aquila K, Kim SK, Kim J, Song SJ, Hwang CS, Eastman JA, Freeland JW, Hong S. X-ray irradiation induced reversible resistance change in Pt/TiO2/Pt cells. ACS NANO 2014; 8:1584-9. [PMID: 24417284 DOI: 10.1021/nn405867p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The interaction between X-rays and matter is an intriguing topic for both fundamental science and possible applications. In particular, synchrotron-based brilliant X-ray beams have been used as a powerful diagnostic tool to unveil nanoscale phenomena in functional materials. However, it has not been widely investigated how functional materials respond to the brilliant X-rays. Here, we report the X-ray-induced reversible resistance change in 40-nm-thick TiO2 films sandwiched by Pt top and bottom electrodes, and propose the physical mechanism behind the emergent phenomenon. Our findings indicate that there exists a photovoltaic-like effect, which modulates the resistance reversibly by a few orders of magnitude, depending on the intensity of impinging X-rays. We found that this effect, combined with the X-ray irradiation induced phase transition confirmed by transmission electron microscopy, triggers a nonvolatile reversible resistance change. Understanding X-ray-controlled reversible resistance changes can provide possibilities to control initial resistance states of functional materials, which could be useful for future information and energy storage devices.
Collapse
Affiliation(s)
- Seo Hyoung Chang
- Materials Science Division, Argonne National Laboratory , Lemont, Illinois 60439, United States
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Ni H, Zhao K, Xi JF, Feng X, Xiang WF, Zhao SQ, Kong YC, Wong HK. Current-pulse-induced enhancement of transient photodetective effect in tilted manganite film. OPTICS EXPRESS 2012; 20:28494-28499. [PMID: 23263085 DOI: 10.1364/oe.20.028494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A current-pulse-induced enhancement effect of transient photovoltage has been discovered in tilted manganite La(2/3)Ca(1/3)MnO(3) film at room temperature. Here, by applying a pulsed current stimulus before pulse laser irradiation, we observed a significant enhancement of more than 50% in photovoltaic sensitivity. The current-pulse-induced photovoltaic enhancement can be tuned not only by the stimulating current value but also by the stimulating time. Such enhancement is time-sensitive and reproducible. This electrically induced effect, observed at room temperature, has both the benefit of a discovery in materials properties and the promise of applications for thin film manganites in photodetectors.
Collapse
Affiliation(s)
- H Ni
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Garganourakis M, Scagnoli V, Huang SW, Staub U, Wadati H, Nakamura M, Guzenko VA, Kawasaki M, Tokura Y. Imprinting magnetic information in manganites with x rays. PHYSICAL REVIEW LETTERS 2012; 109:157203. [PMID: 23102361 DOI: 10.1103/physrevlett.109.157203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Indexed: 06/01/2023]
Abstract
The effect of x rays on an orbital and charge ordered epitaxial film of a Pr0.5Ca0.5MnO3 is presented. As the film is exposed to x rays, the antiferromagnetic response increases and concomitantly the conductivity of the film improve. These results are discussed in terms of a persistent x-ray induced doping, leading to a modification of the magnetic structure. This effect allows writing electronic and magnetic information in the film and represents a novel way of manipulating magnetism.
Collapse
Affiliation(s)
- M Garganourakis
- Swiss Light Source, Paul Scherrer Institut, CH 5232 Villigen PSI, Switzerland
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Cao S, Li J, Wang Z, Tian H, Qin Y, Zeng L, Ma C, Yang H, Li J. Extreme chemical sensitivity of nonlinear conductivity in charge-ordered LuFe(2)O(4). Sci Rep 2012; 2:330. [PMID: 22448317 PMCID: PMC3311055 DOI: 10.1038/srep00330] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Accepted: 03/08/2012] [Indexed: 11/09/2022] Open
Abstract
Nonlinear transport behaviors are crucial for applications in electronic technology. At the nonlinear critical turning point, the nonequilibrium states cause rich physics responses to environment. The corresponding study in this field is crucial for physics and industry application. Here nonlinear conductivity in charge-ordered (CO) LuFe(2)O(4 )has been demonstrated. Remarkable resistivity switching behavior was observed and the gas-sensing property can be reversibly tuned by a small alternation of partial pressure and/or chemical components of the environment. These facts allow us to use LuFe(2)O(4) materials as a sensitive chemical gas sensor in technological applications. Careful analysis of the gas sensing process in LuFe(2)O(4) suggests a novel sensing mechanism in sharp contrast with that discussed for the conventional gas sensors which depend fundamentally on surface chemical reactions.
Collapse
Affiliation(s)
- Shi Cao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics , Chinese Academy of Sciences, Beijing 100190, P. R. China
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Wang MS, Yang C, Wang GE, Xu G, Lv XY, Xu ZN, Lin RG, Cai LZ, Guo GC. A Room-Temperature X-ray-Induced Photochromic Material for X-ray Detection. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108220] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
36
|
Wang MS, Yang C, Wang GE, Xu G, Lv XY, Xu ZN, Lin RG, Cai LZ, Guo GC. A Room-Temperature X-ray-Induced Photochromic Material for X-ray Detection. Angew Chem Int Ed Engl 2012; 51:3432-5. [DOI: 10.1002/anie.201108220] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 01/25/2012] [Indexed: 11/09/2022]
|
37
|
Poccia N, Fratini M, Ricci A, Campi G, Barba L, Vittorini-Orgeas A, Bianconi G, Aeppli G, Bianconi A. Evolution and control of oxygen order in a cuprate superconductor. NATURE MATERIALS 2011; 10:733-736. [PMID: 21857676 DOI: 10.1038/nmat3088] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Accepted: 07/01/2011] [Indexed: 05/31/2023]
Abstract
The disposition of defects in metal oxides is a key attribute exploited for applications from fuel cells and catalysts to superconducting devices and memristors. The most typical defects are mobile excess oxygens and oxygen vacancies, which can be manipulated by a variety of thermal protocols as well as optical and d.c. electric fields. Here we report the X-ray writing of high-quality superconducting regions, derived from defect ordering, in the superoxygenated layered cuprate, La₂CuO(4+y). Irradiation of a poor superconductor prepared by rapid thermal quenching results first in the growth of ordered regions, with an enhancement of superconductivity becoming visible only after a waiting time, as is characteristic of other systems such as ferroelectrics, where strain must be accommodated for order to become extended. However, in La₂CuO(4+y), we are able to resolve all aspects of the growth of (oxygen) intercalant order, including an extraordinary excursion from low to high and back to low anisotropy of the ordered regions. We can also clearly associate the onset of high-quality superconductivity with defect ordering in two dimensions. Additional experiments with small beams demonstrate a photoresist-free, single-step strategy for writing functional materials.
Collapse
|
38
|
Ehrke H, Tobey RI, Wall S, Cavill SA, Först M, Khanna V, Garl T, Stojanovic N, Prabhakaran D, Boothroyd AT, Gensch M, Mirone A, Reutler P, Revcolevschi A, Dhesi SS, Cavalleri A. Photoinduced melting of antiferromagnetic order in La(0.5)Sr(1.5)MnO4 measured using ultrafast resonant soft x-ray diffraction. PHYSICAL REVIEW LETTERS 2011; 106:217401. [PMID: 21699341 DOI: 10.1103/physrevlett.106.217401] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Indexed: 05/15/2023]
Abstract
We used ultrafast resonant soft x-ray diffraction to probe the picosecond dynamics of spin and orbital order in La(0.5)Sr(1.5)MnO(4) after photoexcitation with a femtosecond pulse of 1.5 eV radiation. Complete melting of antiferromagnetic spin order is evidenced by the disappearance of a (1/4,1/4,1/2) diffraction peak. On the other hand, the (1/4,1/4,0) diffraction peak, reflecting orbital order, is only partially reduced. We interpret the results as evidence of destabilization in the short-range exchange pattern with no significant relaxation of the long-range Jahn-Teller distortions. Cluster calculations are used to analyze different possible magnetically ordered states in the long-lived metastable phase. Nonthermal coupling between light and magnetism emerges as a primary aspect of photoinduced phase transitions in manganites.
Collapse
Affiliation(s)
- H Ehrke
- Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Chaudhuri S, Pandey NK, Saini S, Budhani RC. Dynamics of a robust photo-induced insulator-metal transition driven by coherent and broad-band light in epitaxial films of La(0.625-y)Pr(y)Ca(0.375)MnO(3). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:275502. [PMID: 21399257 DOI: 10.1088/0953-8984/22/27/275502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A dramatic drop of ≈5 orders of magnitude in the resistance (R) of La(0.175)Pr(0.45)Ca(0.375)MnO(3) epitaxial films upon exposure to optical photons derived from both continuous and pulsed lasers, as well as broad-band sources at temperatures (T) < 30 K is reported. The strength of change is a sensitive function of both the incident photon flux and temperature. Under isothermal conditions the photo-generated low resistance state persists eternally after removal of light. This non-equilibrium state is metallic, as revealed by the positive dR/dT for T ≤ T(p) (≈120 K). This electrically conducting state is presumably ferromagnetic as T(p) coincides with the temperature where a weak ferromagnetism sets in on cooling the insulating film from room temperature. To rule out the possibility of photon-induced local heating of the sample as a mechanism of the observed effects, photo-illumination experiments were performed under identical conditions on thin films of two non-charge-ordered manganites deposited on substrates of similar thermal conductivity. Our model for the observed transition encompasses a global charge-ordered state in which ferromagnetic metallic clusters of fraction p much less than the critical fraction p(c) for percolation exists at low temperatures. Photo-induced melting of the charge-ordered state increases this fraction beyond p(c) in a cumulative manner as successive pulses of light fall on the sample.
Collapse
Affiliation(s)
- S Chaudhuri
- Condensed Matter—Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | | | | | | |
Collapse
|
40
|
Beyreuther E, Thiessen A, Grafström S, Dörr K, Eng LM. Large photoconductivity of oxygen-deficient La(0.7)Ca(0.3)MnO(3)/SrTiO(3) heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:175506. [PMID: 21393673 DOI: 10.1088/0953-8984/22/17/175506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The electrical resistance of stoichiometric and oxygen-deficient epitaxial 10 nm thick La(0.7)Ca(0.3)MnO(3) thin films on SrTiO(3) under photoexcitation covering the visible to the ultraviolet range has been investigated systematically as a function of illumination intensity, wavelength and temperature. In contrast to as-prepared films, the oxygen-deficient samples exhibit large photoconductivity of several orders of magnitude at low temperatures. By our detailed comparative analysis of the electrical conductivity of the film/substrate heterostructure and the bare substrate we are able to elucidate contributions of both carrier generation in the film and carrier injection from the substrate to the observed effect.
Collapse
Affiliation(s)
- E Beyreuther
- Institute of Applied Photophysics, Technische Universität Dresden, D-01062 Dresden, Germany.
| | | | | | | | | |
Collapse
|
41
|
Kim M, Barath H, Chen X, Joe YI, Fradkin E, Abbamonte P, Cooper SL. Magnetic-field- and pressure-induced quantum phases in complex materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:1148-1155. [PMID: 20401939 DOI: 10.1002/adma.200904246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This Progress Report presents temperature-, magnetic-field-, and pressure-dependent Raman measurements of strongly correlated materials such as the charge-ordering manganese perovskites, the multiferroic material TbMnO(3), and the charge-density wave (CDW) materials 1T-TiSe(2) and Cu(x)TiSe(2). These studies illustrate the rich array of phases and properties that can be accessed with field and pressure tuning in these materials, and demonstrate the efficacy of using magnetic-field- and pressure-dependent scattering methods to elucidate the microscopic changes associated with highly tunable behavior in complex materials.
Collapse
Affiliation(s)
- Minjung Kim
- Department of Physics and Frederick Seitz Materials Research Laboratory University of Illinois, Urbana-Champaign Urbana, IL 61801, USA
| | | | | | | | | | | | | |
Collapse
|
42
|
Poneti G, Mannini M, Sorace L, Sainctavit P, Arrio MA, Otero E, Criginski Cezar J, Dei A. Soft-X-ray-Induced Redox Isomerism in a Cobalt Dioxolene Complex. Angew Chem Int Ed Engl 2010; 49:1954-7. [DOI: 10.1002/anie.200906895] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
43
|
Poneti G, Mannini M, Sorace L, Sainctavit P, Arrio MA, Otero E, Criginski Cezar J, Dei A. Soft-X-ray-Induced Redox Isomerism in a Cobalt Dioxolene Complex. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906895] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
44
|
Kumar D, Rajeev KP, Alonso JA, Martínez-Lope MJ. Evidence of kinetically arrested supercooled phases in the perovskite oxide NdNiO(3). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:485402. [PMID: 21832516 DOI: 10.1088/0953-8984/21/48/485402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report the time and temperature dependent response of thermopower in the non-magnetic perovskite oxide NdNiO(3). We find that on cooling below the metal-insulator transition temperature the system evolves into a phase separated state which consists of supercooled metallic and insulating phases. This phase separated state exhibits out of equilibrium features, such as cooling rate dependence and time dependence. The existence of these dynamical features is attributed to the transformation of supercooled metallic phases to the insulating state. On cooling, a small fraction of the supercooled phases get kinetically arrested in a glassy state and these supercooled phases remain in that state down to low temperature. In the heating cycle the arrested states de-arrest above 150 K and this results in the reappearance of time dependent features.
Collapse
Affiliation(s)
- Devendra Kumar
- Department of Physics, Indian Institute of Technology, Kanpur 208016, India
| | | | | | | |
Collapse
|
45
|
X-ray-induced persistent photoconductivity in La0.9A0.1MnO3 (A=Sr, Ca). Radiat Phys Chem Oxf Engl 1993 2009. [DOI: 10.1016/j.radphyschem.2009.06.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
46
|
Sathe VG, Rawat R, Dubey A, Narlikar AV, Prabhakaran D. Photo-induced insulator-metal transition probed by Raman spectroscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:075603. [PMID: 21817333 DOI: 10.1088/0953-8984/21/7/075603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Strongly correlated electron systems give an opportunity to manipulate charge, orbital, magnetic and structural phases of matter. Here we show that the insulating phase where charges are localized can be delocalized through photo-excitation which, in turn changes the structure locally, inducing an orthorhombic to rhombohedral phase transition. The I-M transition was witnessed for La(1-x)Sr(x)MnO(3) compounds in Raman spectra and photo-induced conduction simultaneously. A simple continuous argon ion laser source was used for optical excitation. The photon energy was 2.53 eV and the power can be chosen anywhere between 5 and 45 mW. Our studies clearly bring out the role of local disorder in the form of Jahn-Teller distortion in the localization of electrons.
Collapse
Affiliation(s)
- V G Sathe
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017, India
| | | | | | | | | |
Collapse
|
47
|
Tobey RI, Prabhakaran D, Boothroyd AT, Cavalleri A. Ultrafast electronic phase transition in La1/2Sr3/2MnO4 by coherent vibrational excitation: evidence for nonthermal melting of orbital order. PHYSICAL REVIEW LETTERS 2008; 101:197404. [PMID: 19113311 DOI: 10.1103/physrevlett.101.197404] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Indexed: 05/27/2023]
Abstract
An ultrafast electronic phase transition, associated with melting of orbital order, is driven in La1/2Sr3/2MnO4 by selectively exciting the Mn-O stretching mode with femtosecond pulses at 16 microm wavelength. The energy coupled into this vibration is less than 1% of that necessary to induce the transition thermally. Nonthermal melting of this electronic phase originates from coherent lattice displacements comparable to the static Jahn-Teller distortion.
Collapse
Affiliation(s)
- R I Tobey
- Department of Physics, University of Oxford, Oxford, United Kingdom
| | | | | | | |
Collapse
|
48
|
Siwach PK, Singh HK, Srivastava ON. Low field magnetotransport in manganites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:273201. [PMID: 21694362 DOI: 10.1088/0953-8984/20/27/273201] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The perovskite manganites with generic formula RE(1-x)AE(x)MnO(3) (RE = rare earth, AE = Ca, Sr, Ba and Pb) have drawn considerable attention, especially following the discovery of colossal magnetoresistance (CMR). The most fundamental property of these materials is strong correlation between structure, transport and magnetic properties. They exhibit extraordinary large magnetoresistance named CMR in the vicinity of the insulator-metal/paramagnetic-ferromagnetic transition at relatively large applied magnetic fields. However, for applied aspects, occurrence of significant CMR at low applied magnetic fields would be required. This review consists of two sections: in the first section we have extensively reviewed the salient features, e.g. structure, phase diagram, double-exchange mechanism, Jahn-Teller effect, different types of ordering and phase separation of CMR manganites. The second is devoted to an overview of experimental results on CMR and related magnetotransport characteristics at low magnetic fields for various doped manganites having natural grain boundaries such as polycrystalline, nanocrystalline bulk and films, manganite-based composites and intrinsically layered manganites, and artificial grain boundaries such as bicrystal, step-edge and laser-patterned junctions. Some other potential magnetoresistive materials, e.g. pyrochlores, chalcogenides, ruthenates, diluted magnetic semiconductors, magnetic tunnel junctions, nanocontacts etc, are also briefly dealt with. The review concludes with an overview of grain-boundary-induced low field magnetotransport behavior and prospects for possible applications.
Collapse
Affiliation(s)
- P K Siwach
- Physics Department, Banaras Hindu University, Varanasi-221 005, India
| | | | | |
Collapse
|
49
|
|
50
|
Miyasaka S, Yasue T, Fujioka J, Yamasaki Y, Okimoto Y, Kumai R, Arima T, Tokura Y. Magnetic field switching between the two orbital-ordered states in DyVO3. PHYSICAL REVIEW LETTERS 2007; 99:217201. [PMID: 18233244 DOI: 10.1103/physrevlett.99.217201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Indexed: 05/25/2023]
Abstract
The critical phase competition between different spin-orbital-ordered states has been investigated for the DyVO3 single crystal. As temperature is lowered, the compound exhibits a reentrant spin and orbital ordering (SO and OO) transition: C-->G-->C type for SO and G-->C-->G type for OO. It was found that a magnetic field also drives the phase transition from C to G for OO and concomitantly from G to C for SO, the latter of which is coupled with the metamagnetic transition of the Dy 4f moments. The mechanism of this novel magnetic-field-induced orbital switching is discussed.
Collapse
Affiliation(s)
- S Miyasaka
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | | | | | | | | | | | | | | |
Collapse
|