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Das RR, Leclercq B, Bouvier P, Arévalo-López AM, Goujon C, Itié JP, Polian A, Mentré O, Colin CV. Compressibility of structural modulation waves in the chain compounds BaCoX 2O 7 (X = As, P): a powder study. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2022; 78:162-171. [PMID: 35411855 DOI: 10.1107/s2052520622001159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
BaCoX2O7 (X = As, P) are built on magnetic 1D units in which strong aperiodic undulations originate from incommensurate structural modulations with large atomic displacive amplitudes perpendicular to the chain directions, resulting in very unique multiferroic properties. High-pressure structural and vibrational properties of both compounds have been investigated by synchrotron X-ray powder diffraction and Raman spectroscopy at room temperature and combined with density functional calculations. A structural phase transition is observed at 1.8 GPa and 6.8 GPa in BaCoAs2O7 and BaCoP2O7, respectively. Sharp jumps are observed in their unit-cell volumes and in Raman mode frequencies, thus confirming the first-order nature of their phase transition. These transitions involve the disappearance of the modulation from the ambient-pressure polymorph with clear spectroscopic fingerprints, such as reduction of the number of Raman modes and change of shape on some peaks. The relation between the evolution of the Raman modes along with the structure are presented and supported by density functional theory structural relaxations.
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Affiliation(s)
- Ranjana R Das
- Institut Néel, Université Grenoble Alpes, CNRS, Grenoble, 38042, France
| | - Bastien Leclercq
- UCCS (Unité de Catalyse et Chimie du Solide), CNRS UMR 8181, Bâtiment C7, Univ. Lille - Centrale Lille/ENSCL, Avenue Mendeleiev, 59655 - Villeneuve d'Ascq, France
| | - Pierre Bouvier
- Institut Néel, Université Grenoble Alpes, CNRS, Grenoble, 38042, France
| | - Angel M Arévalo-López
- UCCS (Unité de Catalyse et Chimie du Solide), CNRS UMR 8181, Bâtiment C7, Univ. Lille - Centrale Lille/ENSCL, Avenue Mendeleiev, 59655 - Villeneuve d'Ascq, France
| | - Céline Goujon
- Institut Néel, Université Grenoble Alpes, CNRS, Grenoble, 38042, France
| | - Jean Paul Itié
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin BP48, Gif sur Yvette Cedex, 91192, France
| | - Alain Polian
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin BP48, Gif sur Yvette Cedex, 91192, France
| | - Olivier Mentré
- UCCS (Unité de Catalyse et Chimie du Solide), CNRS UMR 8181, Bâtiment C7, Univ. Lille - Centrale Lille/ENSCL, Avenue Mendeleiev, 59655 - Villeneuve d'Ascq, France
| | - Claire V Colin
- Institut Néel, Université Grenoble Alpes, CNRS, Grenoble, 38042, France
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Liu CB, Cheng JB, He JB, Chen R, Yue XY, Luo YS, Yang G, Zhou DW, Huang JS, Yu RM, Leng YM. Unusual magnetization process and magnetocaloric effect in α-CoV 2O 6driven by pulsed magnetic fields. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:435703. [PMID: 34343981 DOI: 10.1088/1361-648x/ac1a31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 08/03/2021] [Indexed: 06/13/2023]
Abstract
In low-dimensional Ising spin systems, an interesting observation is the presence of step magnetization at low temperatures. Here we combine both DC and pulsed magnetic fields to study the 1/3 magnetization plateau and multiple steps in the Ising spin-chain material α-CoV2O6. Magnetization in pulsed fields is quite different from that in DC fields, showing multiple steps in an intermediate range of 4.2-6 K, inverted hysteresis below 4.2 K and asymmetric magnetization in negative fields below 11 K. We demonstrate that these unusual behaviors in magnetization are caused by the spin dynamics and the anomalous magnetocaloric effect (MCE) in α-CoV2O6, i.e., abrupt changes of sample temperature in adiabatic conditions. We successfully separate the influence between the intrinsic slow spin dynamics and the quasi-extrinsic temperature change. From the MCE, we find that some irreversible behavior is originated from the slow spin dynamics. Two different slow dynamics associated with the metastable steps are observed: one is sensitive to the slow field sweep rate at the order of ∼mT s-1and weakly depends on temperature, while the other responds to the rapid field sweep rate of ∼kT s-1and dominates at lowest temperature. We also distinguish that the metastable transition atH4is the first order and crucial for the ferrimagnetic to ferromagnetic transition. This study is useful to the understanding of multistep magnetization in α-CoV2O6and sheds light on recent experimental findings of related compounds.
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Affiliation(s)
- C B Liu
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - J B Cheng
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - J B He
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - R Chen
- Key Laboratory of Microelectronics and Energy of Henan Province, Henan Joint International Research Laboratory of New Energy Storage Technology, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - X Y Yue
- Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, People's Republic of China
| | - Y S Luo
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
- Key Laboratory of Microelectronics and Energy of Henan Province, Henan Joint International Research Laboratory of New Energy Storage Technology, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - G Yang
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - D W Zhou
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - J S Huang
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - R M Yu
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
| | - Y M Leng
- Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China
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Chandra M, Yadav S, Rawat R, Singh K. Enhancement of magnetoelectric coupling in Cr doped Mn 2O 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:295703. [PMID: 32168503 DOI: 10.1088/1361-648x/ab7fdc] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The effect of Cr doping has been undertaken to investigate its effect on the structural, magnetic, dielectric and magnetoelectric properties of newly discovered multiferroics material α-Mn2O3. The Cr doping modifies the room temperature crystal symmetry i.e. transforms from orthorhombic to cubic symmetry. Similar to α-Mn2O3, two magnetic transitions have been observed in all Cr doped samples. The effect of Cr doping manifested on the low temperature transition. The lower magnetic transition shifted toward higher temperature (25 K for pristine to 40 K for Cr = 10%) whereas the high temperature transition decreases slightly with increasing Cr content. A clear frequency independent transition is observed in temperature dependent complex dielectric measurements for Mn2-x Cr x O3 (0 ⩽ x ⩽ 0.10) samples around high temperature magnetic ordering ∼80 K which corroborate the magnetoelectric coupling in these samples. Interestingly, the magnetodielectric value enhanced significantly with Cr doping and a maximum increase of ∼21% is observed for 10% Cr doped sample at 5 K around 70 kOe magnetic field.
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Affiliation(s)
- Mohit Chandra
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001, India
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Liu CB, He ZZ, Wang SL, Yang M, Liu Y, Liu YJ, Chen R, Zhu HP, Dong C, Ke JZ, Ouyang ZW, Xia ZC, Wang JF. Field-induced magnetic transitions and strong anisotropy in α-CoV 2O 6 single crystal. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:375802. [PMID: 31163414 DOI: 10.1088/1361-648x/ab26fe] [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 Ising-like antiferromagnet α-CoV2O6 has received considerable interests because of stabilized 1/3 magnetization plateau around 5 K under magnetic field applied along magnetic easy c-axis. In this work, this magnetization plateau was studied by varying temperature or rotating magnetic field. As temperature decreased, this stabilized plateau collapsed, and additional magnetic transitions were observed. As a result, a rich magnetic phase diagram was constructed and extended to temperature lower than previously reported. When magnetic field moved from the c to b (or a) axis, the magnetization plateau developed with field directions and vanished finally when the field was restricted in the ab plane. An impressive observation is that this 1/3-plateau can be stabilized and remain robust even when magnetic field deviated from the c axis, accompanied by the evolutions of the magnetic moments and the critical transition fields. We suppose that the origins of these temperature and angular dependences of the 1/3 magnetization plateau are related to strong spin-orbital coupling. Indeed, electron spin resonance (ESR) measurement gives large Landé factor of 8.9, evidencing that there exists strong spin-orbital coupling.
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Affiliation(s)
- C B Liu
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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Nandi M, Prabhakaran D, Mandal P. Spin-charge-lattice coupling in quasi-one-dimensional Ising spin chain CoNb 2O 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:195802. [PMID: 30731434 DOI: 10.1088/1361-648x/ab0539] [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
Magnetization, magnetostriction and dielectric constant measurements are performed on single crystals of quasi-one-dimensional Ising spin chain CoNb2O6 at temperatures below and above the antiferromagnetic phase transition. Field-induced magnetic transitions are clearly reflected in magnetodielectric and magnetostriction data. Sharp anomalies are observed around the critical fields of antiferromagnetic to ferrimagnetic and ferrimagnetic to saturated-paramagnetic transition in both magnetodielectric and magnetostriction experiments. Detailed analysis of temperature and field dependence of dielectric constant and magnetostriction suggests that spins are coupled with lattice as well as charges in CoNb2O6. Below the antiferromagnetic transition temperature, the overall resemblance in anomalies, observed in various physical parameters such as magnetization, dielectric constant, magnetostriction and magnetic entropy change gives a deeper insight about the influence of spin configuration on these parameters in CoNb2O6.
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Affiliation(s)
- Moumita Nandi
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Calcutta 700 064, India
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Mondal C, Sasmal AK, Yusuf SM, Mukadam MD, Pal J, Ganguly M, Pal T. Modified hydrothermal reaction (MHT) for CoV2O6·4H2O nanowire formation and the transformation to CoV2O6·2H2O single-crystals for antiferromagnetic ordering and spin-flop. RSC Adv 2014. [DOI: 10.1039/c4ra09976a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Feng F, Hu S, Guo Y, Zhao J, Chan NY, Fei L, Yan W, Ning W, Yang J, Wang Y, Xie Y, Wu C. Room-temperature large magnetic-dielectric coupling in new phase anatase VTiO4. Chem Commun (Camb) 2013; 49:10462-4. [DOI: 10.1039/c3cc42880j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rao CNR, Sundaresan A, Saha R. Multiferroic and Magnetoelectric Oxides: The Emerging Scenario. J Phys Chem Lett 2012; 3:2237-2246. [PMID: 26295776 DOI: 10.1021/jz300688b] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Multiferroics were considered to be rare because magnetism and ferroelectricity require entirely different criteria for the materials. Several multiferroic oxides have, however, been discovered in the past few years by virtue of novel operating mechanisms, the most effective one being ferroelectricity driven by magnetism itself. Many such oxides where the magnetic and electric order parameters interact also exhibit magnetoelectric or magnetodielectric properties. In this Perspective, properties of manganites, ferrites, and other monophasic multiferroic oxides with spin-induced electric polarization are described. Multiferroic properties arising from charge ordering are examined. The present status of BiMnO3, which is an unusual example of a ferromagnetic-ferroelectric, is presented. Recent findings suggest that it is likely that many more multiferroic and magnetoelectric oxide materials exhibiting magnetically induced ferroelectricity will be found in the future.
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Affiliation(s)
- C N R Rao
- Chemistry and Physics of Materials Unit, International Centre for Materials Science and CSIR Unit of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - A Sundaresan
- Chemistry and Physics of Materials Unit, International Centre for Materials Science and CSIR Unit of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - Rana Saha
- Chemistry and Physics of Materials Unit, International Centre for Materials Science and CSIR Unit of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
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