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Broken C4 symmetry in the tetragonal state of uniaxial strained BaCo0.9Ni0.1S1.9

Shin-ichi Shamoto1,2,3,4,*, Hiroki Yamauchi5, Kazuhiko Ikeuchi1, Ryoichi Kajimoto6, and Jun'ichi Ieda3

  • 1Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
  • 2Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
  • 3Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
  • 4Meson Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
  • 5Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
  • 6J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan

  • *s_shamoto@cross.or.jp
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Phys. Rev. Research 3, 013169 – Published 22 February, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.013169

Abstract

A compound with large anions is known to show large compressibility, whereby a novel response may emerge from the degenerated state by a uniaxial pressure. Neutron scattering study of BaCo0.9Ni0.1S1.9 crystal reveals that the tetragonal insulating state has two magnetic domains with in-plane anisotropic antiferromagnetic wave vectors Q1=(π,0) and Q2=(0,π). The magnetic order with in-plane broken C4 symmetry is realized as a twin of these two domains in the tetragonal state without any strain. One magnetic domain with Q2 becomes dominant under a weak strain without any appreciable structural distortion. Correspondingly, the in-plane broken C4 symmetry is also observed in the in-plane magnetic excitation of the tetragonal state.

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Phys. Rev. Research 3, 013169– Published 22 February, 2021
  • Received 16 October 2020
  • Revised 21 December 2020
  • Accepted 16 January 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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