Magnetic field induced ferroelectricity and half magnetization plateau in polycrystalline R2V2O7(R=Ni,Co)

R. Chen, J. F. Wang, Z. W. Ouyang, Z. Z. He, S. M. Wang, L. Lin, J. M. Liu, C. L. Lu, Y. Liu, C. Dong, C. B. Liu, Z. C. Xia, A. Matsuo, Y. Kohama, and K. Kindo
Phys. Rev. B 98, 184404 – Published 5 November 2018

Abstract

Low-dimensional frustrated antiferromagnet is a good model system to study exotic quantum physics. Here we report the observation of half magnetization plateau and ferroelectricity which emerge simultaneously in the bond-alternating skew-chain compounds R2V2O7(R=Ni,Co) induced by high magnetic fields. The half plateau is stabilized in fields of 8–30 T (7–12 T) for Ni2V2O7(Co2V2O7), whereas two magnetic field induced ferroelectricities are located below and above this plateau. The remarkable high-field ferroelectricity for Ni or Co compound is about 5060μC/m2 for the polycrystalline sample. The resulting magnetic field-temperature (HT) phase diagrams are very complex and several distinct phase transitions are observed. The forced electric polarization by sweeping magnetic fields evidences a clear magnetoelectric coupling in Co2V2O7 associated with the low-field ferroelectricity. Our magnetization data also reveal that Co2V2O7 produces an effective spin-1/2 behavior at the magnetic ground state. These experimental findings improve the knowledge to multiferroics and pave the way for exploring the quantum state of frustrated antiferromagnets.

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  • Received 20 July 2018
  • Revised 28 September 2018

DOI:https://doi.org/10.1103/PhysRevB.98.184404

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Chen1, J. F. Wang1,*, Z. W. Ouyang1,†, Z. Z. He2, S. M. Wang3, L. Lin3, J. M. Liu3, C. L. Lu1, Y. Liu4, C. Dong1,5, C. B. Liu1, Z. C. Xia1, A. Matsuo5, Y. Kohama5, and K. Kindo5

  • 1Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
  • 3Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 4School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 5The Institute for Solid State Physics (ISSP), University of Tokyo, Chiba 277-8581, Japan

  • *jfwang@hust.edu.cn
  • zwouyang@hust.edu.cn

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Issue

Vol. 98, Iss. 18 — 1 November 2018

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