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Title: Pressurizing the HgCr{sub 2}Se{sub 4} spinel at room temperature

The cubic HgCr{sub 2}Se{sub 4} spinel undergoes two structural transitions upon pressure increase. Initially, the ambient-pressure Fd-3m phase transforms into a tetragonal I4{sub 1}/amd structure above 15 GPa. We speculate that this Fd-3m-I4{sub 1}/amd transition is accompanied by an insulator-to-metal transition, resulting in the vanishing of the Raman signal after the structural transformation. Further compression of HgCr{sub 2}Se{sub 4} leads to structural disorder beyond 21 GPa. Our spin-resolved band structure calculations reveal significant changes in the electronic structure of HgCr{sub 2}Se{sub 4} after the Fd-3m-I4{sub 1}/amd transition, whereas the ferromagnetic interactions are found to dominate in both structures.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ; ;  [3] ;  [5]
  1. Department of Physics, Oakland University, Rochester, Michigan 48309 (United States)
  2. Max Planck Institute for Solid State Research, D-70569 Stuttgart (Germany)
  3. Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg (Germany)
  4. (Moldova, Republic of)
  5. High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22257755
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM; CRYSTAL-PHASE TRANSFORMATIONS; ELECTRONIC STRUCTURE; MERCURY; PRESSURIZATION; SELENIUM; SPINELS; TEMPERATURE RANGE 0273-0400 K; TETRAGONAL LATTICES