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Title: Investigation of structural changes in chiral magnet Cr{sub 1∕3}NbS{sub 2} under application of pressure

We perform structural analysis experiments on the chiral magnet Cr{sub 1∕3}NbS{sub 2}, in which Cr{sup 3+} ions are inserted between hexagonal NbS{sub 2} layers. The noncentrosymmetrical nature of the inserted Cr{sup 3+} appears as a distorted CrS{sub 6} octahedron. Under the application of hydrostatic pressure, the lattice shrinks significantly along the c-axis rather than the a-axis. However, at a pressure P of approximately 3–4 GPa, a kink in the rate of decrease in the lattice parameters is observed, and the slight movement of a Nb atom along the c-axis brings about a decrease in the distortion of the CrS{sub 6} octahedron. This structural change qualitatively suggests a decrease in the strength of the Dzyaloshinskii-Moriya (D-M) interaction. Under hydrostatic pressure, the magnetic ordering temperature T{sub C} decreases, and dT{sub C}/dP exhibits a slight change at around 3 GPa. A series of experiments indicates that the change in the structural symmetry of the CrS{sub 6} octahedron influences the exchange network between Cr{sup 3+} ions as well as the D-M interaction.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [4] ;  [5] ;  [6] ;  [4] ;  [5] ;  [5]
  1. Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550 (Japan)
  2. Faculty of Science, Fukuoka University, Fukuoka 814-0180 (Japan)
  3. Graduate School of Arts and Sciences, The Open University of Japan, Chiba 261-8586 (Japan)
  4. Graduate School of Science, Hiroshima University, Higashihiroshima 739-8526 (Japan)
  5. (Japan)
  6. Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 229-8558 (Japan)
Publication Date:
OSTI Identifier:
22410176
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CHIRALITY; CHROMIUM COMPOUNDS; CHROMIUM IONS; CRYSTAL STRUCTURE; LATTICE PARAMETERS; LAYERS; MAGNETIZATION; MAGNETS; NIOBIUM SULFIDES; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; SYMMETRY