High-field magnetization and magnetic phase diagram of α-Cu<sub>2</sub>V<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

High-field magnetization of the spin-1/2 antiferromagnet α-Cu2V2O7 was measured in pulsed magnetic fields of up to 56 T in order to study its magnetic phase diagram [1]. When the field was applied along a-axis, two distinct transitions were observed at Hc1 = 6.5 T and Hc2 = 18.0 T. The former is a spin-flop transition typical for a collinear antiferromagnet and the latter is believed to be a spin-flip transition of canted moments. The canted moments, which are induced by the Dzyaloshinskii-Moriya interactions, anti-align for Hc1 < H < Hc2 due to the anisotropic exchange interaction that favors the antiferromagnetic arrangement along the a-axis. Above Hc2, the Zeeman energy of the applied field overcomes the antiferromagnetic anisotropic interaction and the canted moments are aligned along the field direction. In addition, elastic neutron scattering under the applied magnetic fields of up to 10 T reveals the incommensurate helical spin structure in the spin-flop state.

[1] G. Gitgeatpong, M. Suewattana, Shiwei Zhang, A. Miyake, M. Tokunaga, P. Chanlert, N. Kurita, H. Tanaka, T. J. Sato, Y. Zhao, and K. Matan, Phys. Rev. B 95, 245119 (2017)

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Presenters

  • Ganatee Gitgeatpong

    • Department of Physics, Mahidol University
    • Department of Physics, Phronakhon Rajabhat University

Authors

  • Ganatee Gitgeatpong

    • Department of Physics, Mahidol University
    • Department of Physics, Phronakhon Rajabhat University

  • Malliga Suewattana

    • Department of Physics, Mahidol University

  • Shiwei Zhaang

    • Department of Physics, College of William and Marry

  • Atsushi Miyake

    • The Institute for Solid State Physics, The University of Tokyo
    • University of Tokyo
    • ISSP, The University of Tokyo
    • Institute of Solid State Physics (ISSP), Univ of Tokyo

  • Masashi Tokunaga

    • The Institute for Solid State Physics, The University of Tokyo
    • University of Tokyo
    • ISSP, The University of Tokyo
    • Institute of Solid State Physics (ISSP), Univ of Tokyo

  • Purintorn Chanlert

    • Department of Physics, Tokyo Institute of Technology

  • Nobuyuki Kurita

    • Department of Physics, Tokyo Institute of Technology

  • Hidekazu Tanaka

    • Department of Physics, Tokyo Institute of Technology

  • Taku Sato

    • IMRAM, Tohoku University
    • Tohoku University

  • Yang Zhao

    • Univ of Maryland-College Park
    • Department of Materials Science and Engineering, University of Marryland

  • Kit Matan

    • Department of Physics, Mahidol University