1
|
Naritsuka M, Benedičič I, Rhodes LC, Marques CA, Trainer C, Li Z, Komarek AC, Wahl P. Compass-like manipulation of electronic nematicity in Sr 3Ru 2O 7. Proc Natl Acad Sci U S A 2023; 120:e2308972120. [PMID: 37639583 PMCID: PMC10483601 DOI: 10.1073/pnas.2308972120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 07/26/2023] [Indexed: 08/31/2023] Open
Abstract
Electronic nematicity has been found in a wide range of strongly correlated electron materials, resulting in the electronic states having-4.5pc]Please note that the spelling of the following author name(s) in the manuscript differs from the spelling provided in the article metadata: Izidor Benedičič. The spelling provided in the manuscript has been retained; please confirm. a symmetry that is lower than that of the crystal that hosts them. One of the most astonishing examples is [Formula: see text], in which a small in-plane component of a magnetic field induces significant resistivity anisotropy. The direction of this anisotropy follows the direction of the in-plane field. The microscopic origin of this field-induced nematicity has been a long-standing puzzle, with recent experiments suggesting a field-induced spin density wave driving the anisotropy. Here, we report spectroscopic imaging of a field-controlled anisotropy of the electronic structure at the surface of [Formula: see text]. We track the electronic structure as a function of the direction of the field, revealing a continuous change with the angle. This continuous evolution suggests a mechanism based on spin-orbit coupling resulting in compass-like control of the electronic bands. The anisotropy of the electronic structure persists to temperatures about an order of magnitude higher compared to the bulk, demonstrating novel routes to stabilize such phases over a wider temperature range.
Collapse
Affiliation(s)
- Masahiro Naritsuka
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| | - Izidor Benedičič
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| | - Luke C. Rhodes
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| | - Carolina A. Marques
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| | - Christopher Trainer
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| | - Zhiwei Li
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | | | - Peter Wahl
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom
| |
Collapse
|
2
|
Wang W, Li J, Liang Z, Wu L, Lozano PM, Komarek AC, Shen X, Reid AH, Wang X, Li Q, Yin W, Sun K, Robinson IK, Zhu Y, Dean MP, Tao J. Verwey transition as evolution from electronic nematicity to trimerons via electron-phonon coupling. Sci Adv 2023; 9:eadf8220. [PMID: 37294769 PMCID: PMC10256157 DOI: 10.1126/sciadv.adf8220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 05/04/2023] [Indexed: 06/11/2023]
Abstract
Understanding the driving mechanisms behind metal-insulator transitions (MITs) is a critical step toward controlling material's properties. Since the proposal of charge order-induced MIT in magnetite Fe3O4 in 1939 by Verwey, the nature of the charge order and its role in the transition have remained elusive. Recently, a trimeron order was found in the low-temperature structure of Fe3O4; however, the expected transition entropy change in forming trimeron is greater than the observed value, which arises a reexamination of the ground state in the high-temperature phase. Here, we use electron diffraction to unveil that a nematic charge order on particular Fe sites emerges in the high-temperature structure of bulk Fe3O4 and that, upon cooling, a competitive intertwining of charge and lattice orders arouses the Verwey transition. Our findings discover an unconventional type of electronic nematicity in correlated materials and offer innovative insights into the transition mechanism in Fe3O4 via the electron-phonon coupling.
Collapse
Affiliation(s)
- Wei Wang
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Jun Li
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Zhixiu Liang
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Lijun Wu
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Pedro M. Lozano
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA
| | - Alexander C. Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Street 40, 01187 Dresden, Germany
| | - Xiaozhe Shen
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Alex H. Reid
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Xijie Wang
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Qiang Li
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA
| | - Weiguo Yin
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Kai Sun
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ian K. Robinson
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
- London Centre for Nanotechnology, University College, London WC1E 6BT, UK
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Mark P.M. Dean
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Jing Tao
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973, USA
| |
Collapse
|
3
|
Huang H, Chang YC, Huang YC, Li L, Komarek AC, Tjeng LH, Orikasa Y, Pao CW, Chan TS, Chen JM, Haw SC, Zhou J, Wang Y, Lin HJ, Chen CT, Dong CL, Kuo CY, Wang JQ, Hu Z, Zhang L. Unusual double ligand holes as catalytic active sites in LiNiO 2. Nat Commun 2023; 14:2112. [PMID: 37055401 PMCID: PMC10102180 DOI: 10.1038/s41467-023-37775-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 03/30/2023] [Indexed: 04/15/2023] Open
Abstract
Designing efficient catalyst for the oxygen evolution reaction (OER) is of importance for energy conversion devices. The anionic redox allows formation of O-O bonds and offers higher OER activity than the conventional metal sites. Here, we successfully prepare LiNiO2 with a dominant 3d8L configuration (L is a hole at O 2p) under high oxygen pressure, and achieve a double ligand holes 3d8L2 under OER since one electron removal occurs at O 2p orbitals for NiIII oxides. LiNiO2 exhibits super-efficient OER activity among LiMO2, RMO3 (M = transition metal, R = rare earth) and other unary 3d catalysts. Multiple in situ/operando spectroscopies reveal NiIII→NiIV transition together with Li-removal during OER. Our theory indicates that NiIV (3d8L2) leads to direct O-O coupling between lattice oxygen and *O intermediates accelerating the OER activity. These findings highlight a new way to design the lattice oxygen redox with enough ligand holes created in OER process.
Collapse
Affiliation(s)
- Haoliang Huang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Yu-Chung Chang
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Yu-Cheng Huang
- Department of Physics, Tamkang University, New Taipei City, Taiwan, ROC
| | - Lili Li
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Alexander C Komarek
- Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany
| | - Liu Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany
| | - Yuki Orikasa
- Department of Applied Chemistry, Ritsumeikan University, Kusatsu, Shiga, 535-8577, Japan
| | - Chih-Wen Pao
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Jin-Ming Chen
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Shu-Chih Haw
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Jing Zhou
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Yifeng Wang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Chung-Li Dong
- Department of Physics, Tamkang University, New Taipei City, Taiwan, ROC
| | - Chang-Yang Kuo
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, ROC
| | - Jian-Qiang Wang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany
| | - Linjuan Zhang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
- University of Chinese Academy of Sciences, Beijing, 10049, China.
| |
Collapse
|
4
|
Marques CA, Rhodes LC, Benedičič I, Naritsuka M, Naden AB, Li Z, Komarek AC, Mackenzie AP, Wahl P. Atomic-scale imaging of emergent order at a magnetic field-induced Lifshitz transition. Sci Adv 2022; 8:eabo7757. [PMID: 36179031 PMCID: PMC9524824 DOI: 10.1126/sciadv.abo7757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 08/15/2022] [Indexed: 06/16/2023]
Abstract
The phenomenology and radical changes seen in material properties traversing a quantum phase transition have captivated condensed matter research over the past decades. Strong electronic correlations lead to exotic electronic ground states, including magnetic order, nematicity, and unconventional superconductivity. Providing a microscopic model for these requires detailed knowledge of the electronic structure in the vicinity of the Fermi energy, promising a complete understanding of the physics of the quantum critical point. Here, we demonstrate such a measurement at the surface of Sr3Ru2O7. Our results show that, even in zero field, the electronic structure is strongly C2 symmetric and that a magnetic field drives a Lifshitz transition and induces a charge-stripe order. We track the changes of the electronic structure as a function of field via quasiparticle interference imaging at ultralow temperatures. Our results provide a complete microscopic picture of the field-induced changes of the electronic structure across the Lifshitz transition.
Collapse
Affiliation(s)
- Carolina A. Marques
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
| | - Luke C. Rhodes
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
| | - Izidor Benedičič
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
| | - Masahiro Naritsuka
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
| | - Aaron B. Naden
- School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Zhiwei Li
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Alexander C. Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Andrew P. Mackenzie
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Peter Wahl
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
| |
Collapse
|
5
|
Stein J, Biesenkamp S, Cronert T, Fröhlich T, Leist J, Schmalzl K, Komarek AC, Braden M. Combined Arrhenius-Merz Law Describing Domain Relaxation in Type-II Multiferroics. Phys Rev Lett 2021; 127:097601. [PMID: 34506184 DOI: 10.1103/physrevlett.127.097601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 07/22/2021] [Indexed: 06/13/2023]
Abstract
Electric fields were applied to multiferroic TbMnO_{3} single crystals to control the chiral domains, and the domain relaxation was studied over 8 decades in time by means of polarized neutron scattering. A surprisingly simple combination of an activation law and the Merz law describes the relaxation times in a wide range of electric field and temperature with just two parameters, an activation-field constant and a characteristic time representing the fastest possible inversion. Over the large part of field and temperature values corresponding to almost 6 orders of magnitude in time, multiferroic domain inversion is thus dominated by a single process, the domain wall motion. Only when approaching the multiferroic transition other mechanisms yield an accelerated inversion.
Collapse
Affiliation(s)
- J Stein
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - S Biesenkamp
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - T Cronert
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - T Fröhlich
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - J Leist
- Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstraße 6, 37077 Göttingen, Germany
| | - K Schmalzl
- Juelich Centre for Neutron Science JCNS, Forschungszentrum Juelich GmbH, Outstation at ILL, 38042 Grenoble, France
| | - A C Komarek
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany
| | - M Braden
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| |
Collapse
|
6
|
Guan D, Ryu G, Hu Z, Zhou J, Dong CL, Huang YC, Zhang K, Zhong Y, Komarek AC, Zhu M, Wu X, Pao CW, Chang CK, Lin HJ, Chen CT, Zhou W, Shao Z. Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors. Nat Commun 2020; 11:3376. [PMID: 32632311 PMCID: PMC7338502 DOI: 10.1038/s41467-020-17108-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 06/09/2020] [Indexed: 11/28/2022] Open
Abstract
Ion leaching from pure-phase oxygen-evolving electrocatalysts generally exists, leading to the collapse and loss of catalyst crystalline matrix. Here, different from previous design methodologies of pure-phase perovskites, we introduce soluble BaCl2 and SrCl2 into perovskites through a self-assembly process aimed at simultaneously tuning dual cation/anion leaching effects and optimizing ion match in perovskites to protect the crystalline matrix. As a proof-of-concept, self-assembled hybrid Ba0.35Sr0.65Co0.8Fe0.2O3-δ (BSCF) nanocomposite (with BaCl2 and SrCl2) exhibits the low overpotential of 260 mV at 10 mA cm-2 in 0.1 M KOH. Multiple operando spectroscopic techniques reveal that the pre-leaching of soluble compounds lowers the difference of interfacial ion concentrations and thus endows the host phase in hybrid BSCF with abundant time and space to form stable edge/face-sharing surface structures. These self-optimized crystalline structures show stable lattice oxygen active sites and short reaction pathways between Co–Co/Fe metal active sites to trigger favorable adsorption of OH− species. Water oxidation catalysis may provide the electrons needed for sustainable fuel production, but catalysts often degrade under working conditions. Here, authors introduce soluble species into perovskites to exert positive ion leaching effects for enhancing perovskite stability and activity.
Collapse
Affiliation(s)
- Daqin Guan
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China
| | - Gihun Ryu
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| | - Zhiwei Hu
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| | - Jing Zhou
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Chung-Li Dong
- Department of Physics, Tamkang University, 151 Yingzhuan Rd., New Taipei City, 25137, Taiwan
| | - Yu-Cheng Huang
- Department of Physics, Tamkang University, 151 Yingzhuan Rd., New Taipei City, 25137, Taiwan
| | - Kaifeng Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China
| | - Yijun Zhong
- WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University, Perth, WA, 6845, Australia
| | - Alexander C Komarek
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| | - Ming Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China
| | - Xinhao Wu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China
| | - Chih-Wen Pao
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Chung-Kai Chang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Wei Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China.
| | - Zongping Shao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China.
| |
Collapse
|
7
|
Zhu Y, Tahini HA, Hu Z, Chen ZG, Zhou W, Komarek AC, Lin Q, Lin HJ, Chen CT, Zhong Y, Fernández-Díaz MT, Smith SC, Wang H, Liu M, Shao Z. Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide. Adv Mater 2020; 32:e1905025. [PMID: 31713899 DOI: 10.1002/adma.201905025] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 10/08/2019] [Indexed: 05/22/2023]
Abstract
Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The diversity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb-like network, Ba4 Sr4 (Co0.8 Fe0.2 )4 O15 (hex-BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X-ray absorption spectroscopy analysis and theoretical calculations. The bulk hex-BSCF material synthesized by the facile and scalable sol-gel method achieves 10 mA cm-2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec-1 ) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.
Collapse
Affiliation(s)
- Yinlong Zhu
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P. R. China
- Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia
| | - Hassan A Tahini
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, 2601, Australia
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Nothnitzer Strasse 40, Dresden, 01187, Germany
| | - Zhi-Gang Chen
- Centre for Future Materials, University of Southern Queensland, Springfield, Queensland, 4300, Australia
- Materials Engineering, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Wei Zhou
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P. R. China
| | - Alexander C Komarek
- Max Planck Institute for Chemical Physics of Solids, Nothnitzer Strasse 40, Dresden, 01187, Germany
| | - Qian Lin
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P. R. China
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Yijun Zhong
- Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia
| | - M T Fernández-Díaz
- Institut Laue-Langevin (ILL), 71 avenue des Martyrs, F-38042, Grenoble, Cedex 9, France
| | - Sean C Smith
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, 2601, Australia
| | - Huanting Wang
- Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia
| | - Meilin Liu
- Center for Innovative Fuel Cell and Battery Technologies, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Zongping Shao
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P. R. China
- Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia
| |
Collapse
|
8
|
Leedahl B, Sundermann M, Amorese A, Severing A, Gretarsson H, Zhang L, Komarek AC, Maignan A, Haverkort MW, Tjeng LH. Origin of Ising magnetism in Ca 3Co 2O 6 unveiled by orbital imaging. Nat Commun 2019; 10:5447. [PMID: 31784516 PMCID: PMC6884600 DOI: 10.1038/s41467-019-13273-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/24/2019] [Indexed: 11/22/2022] Open
Abstract
The one-dimensional cobaltate Ca\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{2}$$\end{document}2O\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{6}$$\end{document}6 is an intriguing material having an unconventional magnetic structure, displaying quantum tunneling phenomena in its magnetization. Using a newly developed experimental method, \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$s$$\end{document}s-core-level non-resonant inelastic x-ray scattering (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$s$$\end{document}s-NIXS), we were able to image the atomic Co \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$3d$$\end{document}3d orbital that is responsible for the Ising magnetism in this system. We can directly observe that corrections to the commonly accepted ideal prismatic trigonal crystal field scheme occur in Ca\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{2}$$\end{document}2O\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{6}$$\end{document}6, and it is the complex \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${d}_{2}$$\end{document}d2 orbital occupied by the sixth electron at the high-spin Co\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{\,\text{trig}\,}^{3+}$$\end{document}trig3+ (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${d}^{6}$$\end{document}d6) sites that generates the Ising-like behavior. The ability to directly relate the orbital occupation with the local crystal structure is essential to model the magnetic properties of this system. Ca\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{2}$$\end{document}2O\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${}_{6}$$\end{document}6 has an unconventional magnetic structure displaying quantum tunnelling phenomena in its magnetization. Here, the authors use s-core-level non-resonant inelastic X-ray scattering to image the atomic Co 3d orbital that is responsible for the Ising magnetism in this system.
Collapse
Affiliation(s)
- Brett Leedahl
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Martin Sundermann
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Andrea Amorese
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Andrea Severing
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Hlynur Gretarsson
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,PETRA III, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany
| | - Lunyong Zhang
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Alexander C Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Antoine Maignan
- Laboratoire CRISMAT, UMR 6508 CNRS-ENSICAEN, 6 bd Maréchal Juin, 14050, Caen Cedex, France
| | - Maurits W Haverkort
- Institute for Theoretical Physics, Heidelberg University, Philosophenweg 19, 69120, Heidelberg, Germany
| | - Liu Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.
| |
Collapse
|
9
|
Liu XH, Chang CF, Tjeng LH, Komarek AC, Wirth S. Large magnetoresistance effects in Fe 3O 4. J Phys Condens Matter 2019; 31:225803. [PMID: 30836348 DOI: 10.1088/1361-648x/ab0cf4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigated the magnetoresistance (MR) of a single crystal of magnetite, Fe3O4. In an effort to distinguish between different contributions to the MR the samples were prepared in two different initial magnetic states, i.e. by either zero-field or by field cooling from room temperature. The different magnetic structures in this sample have a dramatic effect on the magnetoresistance: for initially zero-field-cooled conditions a negative MR of about -20% is observed just below the Verwey transition at [Formula: see text] K. For decreasing temperature the MR increases, changes sign at ∼78 K and reaches a record positive value of ∼45% at around 50 K. This behavior is completely absent in the field-cooled sample. Magnetization measurements corroborate an alignment of the easy magnetization direction in applied magnetic fields below [Formula: see text] as a cause of the strong effects observed in both, magnetization and MR. Our results point to a complex interplay of structural and magnetocrystalline effects taking place upon cooling Fe3O4 through [Formula: see text].
Collapse
Affiliation(s)
- X H Liu
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
| | | | | | | | | |
Collapse
|
10
|
Shekhar C, Kumar N, Grinenko V, Singh S, Sarkar R, Luetkens H, Wu SC, Zhang Y, Komarek AC, Kampert E, Skourski Y, Wosnitza J, Schnelle W, McCollam A, Zeitler U, Kübler J, Yan B, Klauss HH, Parkin SSP, Felser C. Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd). Proc Natl Acad Sci U S A 2018; 115:9140-9144. [PMID: 30154165 PMCID: PMC6140499 DOI: 10.1073/pnas.1810842115] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 Ω-1⋅cm-1 and an anomalous Hall angle as large as 23%. Muon spin-resonance (μSR) studies of GdPtBi indicate a sharp antiferromagnetic transition (TN) at 9 K without any noticeable magnetic correlations above TN Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange splitting of the electronic bands at or near the Fermi energy, which is the source of the chiral anomaly and the AHE.
Collapse
Affiliation(s)
- Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;
| | - Nitesh Kumar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - V Grinenko
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Leibniz Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany
| | - Sanjay Singh
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - R Sarkar
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Shu-Chun Wu
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Yang Zhang
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | | | - Erik Kampert
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Yurii Skourski
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Jochen Wosnitza
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Alix McCollam
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Uli Zeitler
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Jürgen Kübler
- Institute for Solid State Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Binghai Yan
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - H-H Klauss
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - S S P Parkin
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - C Felser
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| |
Collapse
|
11
|
Prasad BE, Kanungo S, Jansen M, Komarek AC, Yan B, Manuel P, Felser C. AgRuO3
, a Strongly Exchange-Coupled Honeycomb Compound Lacking Long-Range Magnetic Order. Chemistry 2017; 23:4680-4686. [DOI: 10.1002/chem.201606057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Beluvalli E. Prasad
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
| | - Sudipta Kanungo
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
- Department of Physics; Indian Institute of Engineering Science and Technology, Shibpur; Howrah 711103 India
| | - Martin Jansen
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
- Max-Planck-Institut für Festkörperforschung; 70569 Stuttgart Germany
| | | | - Binghai Yan
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
| | - Pascal Manuel
- ISIS Facility; Rutherford Appleton Laboratory; Chilton, Didcot OX11 0QX United Kingdom
| | - Claudia Felser
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
| |
Collapse
|
12
|
Zhao L, Fernández-Díaz MT, Tjeng LH, Komarek AC. Oxyhalides: A new class of high-T C multiferroic materials. Sci Adv 2016; 2:e1600353. [PMID: 27386552 PMCID: PMC4928925 DOI: 10.1126/sciadv.1600353] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 04/26/2016] [Indexed: 05/28/2023]
Abstract
Magnetoelectric multiferroics have attracted enormous attention in the past years because of their high potential for applications in electronic devices, which arises from the intrinsic coupling between magnetic and ferroelectric ordering parameters. The initial finding in TbMnO3 has triggered the search for other multiferroics with higher ordering temperatures and strong magnetoelectric coupling for applications. To date, spin-driven multiferroicity is found mainly in oxides, as well as in a few halogenides. We report multiferroic properties for synthetic melanothallite Cu2OCl2, which is the first discovery of multiferroicity in a transition metal oxyhalide. Measurements of pyrocurrent and the dielectric constant in Cu2OCl2 reveal ferroelectricity below the Néel temperature of ~70 K. Thus, melanothallite belongs to a new class of multiferroic materials with an exceptionally high critical temperature. Powder neutron diffraction measurements reveal an incommensurate magnetic structure below T N, and all magnetic reflections can be indexed with a propagation vector [0.827(7), 0, 0], thus discarding the claimed pyrochlore-like "all-in-all-out" spin structure for Cu2OCl2, and indicating that this transition metal oxyhalide is, indeed, a spin-induced multiferroic material.
Collapse
Affiliation(s)
- Li Zhao
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | | | - Liu Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Alexander C. Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| |
Collapse
|
13
|
Nayak AK, Fischer JE, Sun Y, Yan B, Karel J, Komarek AC, Shekhar C, Kumar N, Schnelle W, Kübler J, Felser C, Parkin SSP. Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn3Ge. Sci Adv 2016; 2:e1501870. [PMID: 27152355 PMCID: PMC4846447 DOI: 10.1126/sciadv.1501870] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 03/17/2016] [Indexed: 05/20/2023]
Abstract
It is well established that the anomalous Hall effect displayed by a ferromagnet scales with its magnetization. Therefore, an antiferromagnet that has no net magnetization should exhibit no anomalous Hall effect. We show that the noncolinear triangular antiferromagnet Mn3Ge exhibits a large anomalous Hall effect comparable to that of ferromagnetic metals; the magnitude of the anomalous conductivity is ~500 (ohm·cm)(-1) at 2 K and ~50 (ohm·cm)(-1) at room temperature. The angular dependence of the anomalous Hall effect measurements confirms that the small residual in-plane magnetic moment has no role in the observed effect except to control the chirality of the spin triangular structure. Our theoretical calculations demonstrate that the large anomalous Hall effect in Mn3Ge originates from a nonvanishing Berry curvature that arises from the chiral spin structure, and that also results in a large spin Hall effect of 1100 (ħ/e) (ohm·cm)(-1), comparable to that of platinum. The present results pave the way toward the realization of room temperature antiferromagnetic spintronics and spin Hall effect-based data storage devices.
Collapse
Affiliation(s)
- Ajaya K. Nayak
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
- Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
- Corresponding author. E-mail: (A.K.N.); (S.S.P.P.)
| | - Julia Erika Fischer
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Yan Sun
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Binghai Yan
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Julie Karel
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Alexander C. Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Nitesh Kumar
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Jürgen Kübler
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Stuart S. P. Parkin
- Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
- Corresponding author. E-mail: (A.K.N.); (S.S.P.P.)
| |
Collapse
|
14
|
Prasad BE, Kazin P, Komarek AC, Felser C, Jansen M. β-Ag3 RuO4, a Ruthenate(V) Featuring Spin Tetramers on a Two-Dimensional Trigonal Lattice. Angew Chem Int Ed Engl 2016; 55:4467-71. [PMID: 26945558 DOI: 10.1002/anie.201510576] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Indexed: 11/09/2022]
Abstract
Open-shell solids exhibit a plethora of intriguing physical phenomena that arise from a complex interplay of charge, spin, orbital, and spin-state degrees of freedom. Comprehending these phenomena is an indispensable prerequisite for developing improved functional materials. This type of understanding can be achieved, on the one hand, by experimental and theoretical investigations into known systems, or by synthesizing new solids displaying unprecedented structural and/or electronic features. β-Ag3 RuO4 may serve as such a model system because it possesses a remarkable anionic structure, consisting of tetrameric polyoxoanions (Ru4 O16 )(12-) , and is an embedded fragment of a 2D trigonal MO2 lattice. The notorious frustration of antiferromagnetic (AF) exchange couplings on such lattices is thus lifted, and instead strong AF occurs within the oligomeric anion, where only one exchange path remains frustrated among the relevant six. The strong magnetic anisotropy of the [Ru4 O16 ](12-) ion, and the effectively orbital nature of its net magnetic moment, implies that this anion may reveal the properties of a single-molecule magnet if well-diluted in a diamagnetic matrix.
Collapse
Affiliation(s)
- Beluvalli E Prasad
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany
| | - Pavel Kazin
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany.,Department of Chemistry, Moscow State University, 119991, Moscow, Russia
| | - Alexander C Komarek
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany
| | - Claudia Felser
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany
| | - Martin Jansen
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany. .,Max-Planck-Institut für Festkörperforschung, 70569, Stuttgart, Germany.
| |
Collapse
|
15
|
Prasad BE, Kazin P, Komarek AC, Felser C, Jansen M. β-Ag3RuO4, a Ruthenate(V) Featuring Spin Tetramers on a Two-Dimensional Trigonal Lattice. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510576] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Beluvalli E. Prasad
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
| | - Pavel Kazin
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
- Department of Chemistry; Moscow State University; 119991 Moscow Russia
| | | | - Claudia Felser
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
| | - Martin Jansen
- Max-Planck-Institut für Chemische Physik fester Stoffe; 01187 Dresden Germany
- Max-Planck-Institut für Festkörperforschung; 70569 Stuttgart Germany
| |
Collapse
|
16
|
Stein J, Baum M, Holbein S, Cronert T, Hutanu V, Komarek AC, Braden M. Control of multiferroic domains by external electric fields in TbMnO₃. J Phys Condens Matter 2015; 27:446001. [PMID: 26452106 DOI: 10.1088/0953-8984/27/44/446001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The control of multiferroic domains through external electric fields has been studied by dielectric measurements and by polarized neutron diffraction on single-crystalline TbMnO3. Full hysteresis cycles were recorded by varying an external field of the order of several kV mm(-1) and by recording the chiral magnetic scattering as well as the charge in a sample capacitor. Both methods yield comparable coercive fields that increase upon cooling.
Collapse
Affiliation(s)
- J Stein
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | | | | | | | | | | | | |
Collapse
|
17
|
Drees Y, Li ZW, Ricci A, Rotter M, Schmidt W, Lamago D, Sobolev O, Rütt U, Gutowski O, Sprung M, Piovano A, Castellan JP, Komarek AC. Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides. Nat Commun 2014; 5:5731. [PMID: 25534540 DOI: 10.1038/ncomms6731] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 11/02/2014] [Indexed: 11/09/2022] Open
Abstract
The magnetic excitations in the cuprate superconductors might be essential for an understanding of high-temperature superconductivity. In these cuprate superconductors the magnetic excitation spectrum resembles an hour-glass and certain resonant magnetic excitations within are believed to be connected to the pairing mechanism, which is corroborated by the observation of a universal linear scaling of superconducting gap and magnetic resonance energy. So far, charge stripes are widely believed to be involved in the physics of hour-glass spectra. Here we study an isostructural cobaltate that also exhibits an hour-glass magnetic spectrum. Instead of the expected charge stripe order we observe nano phase separation and unravel a microscopically split origin of hour-glass spectra on the nano scale pointing to a connection between the magnetic resonance peak and the spin gap originating in islands of the antiferromagnetic parent insulator. Our findings open new ways to theories of magnetic excitations and superconductivity in cuprate superconductors.
Collapse
Affiliation(s)
- Y Drees
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - Z W Li
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - A Ricci
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - M Rotter
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| | - W Schmidt
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at ILL, BP 156, 6 Rue Jules Horowitz, 38042 Grenoble, France
| | - D Lamago
- 1] Laboratoire Léon Brillouin, CEA/CNRS,F-91191 Gif-sur Yvette Cedex, UMR12 CEA-CNRS, Bât 563 CEA Saclay, France [2] Institute of Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
| | - O Sobolev
- 1] Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), TU München, Lichtenbergstr. 1, D-85747 Garching, Germany [2] Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, D-37077 Göttingen, Germany
| | - U Rütt
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - O Gutowski
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - M Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - A Piovano
- Institut Laue-Langevin (ILL), 6 Rue Jules Horowitz, F-38043 Grenoble, France
| | - J P Castellan
- 1] Laboratoire Léon Brillouin, CEA/CNRS,F-91191 Gif-sur Yvette Cedex, UMR12 CEA-CNRS, Bât 563 CEA Saclay, France [2] Institute of Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
| | - A C Komarek
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
| |
Collapse
|
18
|
Kuo CY, Drees Y, Fernández-Díaz MT, Zhao L, Vasylechko L, Sheptyakov D, Bell AMT, Pi TW, Lin HJ, Wu MK, Pellegrin E, Valvidares SM, Li ZW, Adler P, Todorova A, Küchler R, Steppke A, Tjeng LH, Hu Z, Komarek AC. k=0 magnetic structure and absence of ferroelectricity in SmFeO3. Phys Rev Lett 2014; 113:217203. [PMID: 25479519 DOI: 10.1103/physrevlett.113.217203] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Indexed: 06/04/2023]
Abstract
SmFeO3 has attracted considerable attention very recently due to its reported multiferroic properties above room temperature. We have performed powder and single crystal neutron diffraction as well as complementary polarization dependent soft X-ray absorption spectroscopy measurements on floating-zone grown SmFeO3 single crystals in order to determine its magnetic structure. We found a k=0 G-type collinear antiferromagnetic structure that is not compatible with inverse Dzyaloshinskii-Moriya interaction driven ferroelectricity. While the structural data reveal a clear sign for magneto-elastic coupling at the Néel-temperature of ∼675 K, the dielectric measurements remain silent as far as ferroelectricity is concerned.
Collapse
Affiliation(s)
- C-Y Kuo
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - Y Drees
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | | | - L Zhao
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - L Vasylechko
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany and Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
| | - D Sheptyakov
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - A M T Bell
- HASYLAB at DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - T W Pi
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
| | - H-J Lin
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
| | - M-K Wu
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - E Pellegrin
- CELLS-ALBA Synchrotron Radiation Facility, Carretera BP 1413, km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - S M Valvidares
- CELLS-ALBA Synchrotron Radiation Facility, Carretera BP 1413, km 3.3, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Z W Li
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - P Adler
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - A Todorova
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - R Küchler
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - A Steppke
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - L H Tjeng
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - Z Hu
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - A C Komarek
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| |
Collapse
|
19
|
Shuvaev A, Dziom V, Pimenov A, Schiebl M, Mukhin AA, Komarek AC, Finger T, Braden M, Pimenov A. Electric field control of terahertz polarization in a multiferroic manganite with electromagnons. Phys Rev Lett 2013; 111:227201. [PMID: 24329467 DOI: 10.1103/physrevlett.111.227201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Indexed: 06/03/2023]
Abstract
All-electrical control of a dynamic magnetoelectric effect is demonstrated in a classical multiferroic manganite DyMnO3, a material containing coupled antiferromagnetic and ferroelectric orders. Because of intrinsic magnetoelectric coupling with electromagnons a linearly polarized terahertz light rotates upon passing through the sample. The amplitude and the direction of the polarization rotation are defined by the orientation of ferroelectric domains and can be switched by static voltage. These experiments allow the terahertz polarization to be tuned using the dynamic magnetoelectric effect.
Collapse
Affiliation(s)
- A Shuvaev
- Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
| | - V Dziom
- Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
| | - Anna Pimenov
- Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
| | - M Schiebl
- Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
| | - A A Mukhin
- Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia
| | - A C Komarek
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
| | - T Finger
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
| | - M Braden
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
| | - A Pimenov
- Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
| |
Collapse
|
20
|
Qureshi N, Steffens P, Drees Y, Komarek AC, Lamago D, Sidis Y, Harnagea L, Grafe HJ, Wurmehl S, Büchner B, Braden M. Inelastic neutron-scattering measurements of incommensurate magnetic excitations on superconducting LiFeAs single crystals. Phys Rev Lett 2012; 108:117001. [PMID: 22540499 DOI: 10.1103/physrevlett.108.117001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Indexed: 05/31/2023]
Abstract
Magnetic correlations in superconducting LiFeAs were studied by elastic and by inelastic neutron-scattering experiments. There is no indication for static magnetic ordering, but inelastic correlations appear at the incommensurate wave vector (0.5±δ,0.5-/+δ,0) with δ~0.07 slightly shifted from the commensurate ordering observed in other FeAs-based compounds. The incommensurate magnetic excitations respond to the opening of the superconducting gap by a transfer of spectral weight.
Collapse
Affiliation(s)
- N Qureshi
- II. Physikalisches Institut, Universität zu Köln, Köln, Germany
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Komarek AC, Isobe M, Hemberger J, Meier D, Lorenz T, Trots D, Cervellino A, Fernández-Díaz MT, Ueda Y, Braden M. Dimerization and charge order in hollandite K₂V₈O₁₆. Phys Rev Lett 2011; 107:027201. [PMID: 21797634 DOI: 10.1103/physrevlett.107.027201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Indexed: 05/31/2023]
Abstract
The metal-insulator transition occurring in hollandite K₂V₈O₁₆ has been studied by means of neutron and x-ray diffraction as well as by thermodynamic and electron-spin resonance measurements. The complete analysis of the crystal structure in the distorted phase allows us to identify dimerization as the main distortion element in insulating K₂V₈O₁₆. At low-temperature, half of the V chains are dimerized perfectly explaining the suppression of magnetic susceptibility due to the formation of spin singlets. The dimerization is accompanied by the segregation of charges into chains.
Collapse
Affiliation(s)
- A C Komarek
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Komarek AC, Streltsov SV, Isobe M, Möller T, Hoelzel M, Senyshyn A, Trots D, Fernández-Díaz MT, Hansen T, Gotou H, Yagi T, Ueda Y, Anisimov VI, Grüninger M, Khomskii DI, Braden M. CaCrO3: an anomalous antiferromagnetic metallic oxide. Phys Rev Lett 2008; 101:167204. [PMID: 18999709 DOI: 10.1103/physrevlett.101.167204] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2008] [Revised: 05/07/2008] [Indexed: 05/27/2023]
Abstract
Combining infrared reflectivity, transport, susceptibility, and several diffraction techniques, we find compelling evidence that CaCrO3 is a rare case of a metallic and antiferromagnetic transition-metal oxide with a three-dimensional electronic structure. Local spin density approximation calculations correctly describe the metallic behavior as well as the anisotropic magnetic ordering pattern of C type: The high Cr valence state induces via sizable pd hybridization remarkably strong next-nearest-neighbor interactions stabilizing this ordering. The subtle balance of magnetic interactions gives rise to magnetoelastic coupling, explaining pronounced structural anomalies observed at the magnetic ordering transition.
Collapse
Affiliation(s)
- A C Komarek
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, Köln, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|