Crystallographic and magnetic structure of HAVAR under high-pressure using diamond anvil cell (DAC)

Itzhak Halevy*, Shlomo Haroush, Yosef Eisen, Ido Silberman, Dany Moreno, Amir Hen, Mike L. Winterrose, Sanjit Ghose, Zhiqiang Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Annealed (H1) and cold-rolled (H2) HAVAR has been studied using high-pressure synchrotron X-ray diffraction. A structural phase transformation was discovered at ~13 GPa at ambient temperature, transforming from m -3 m (S.G.225) to P 63/m m c (S.G.194) symmetry. The transition was not reversible on pressure release. The low-pressure cubic phase was found to be more compressible than the high-pressure hexagonal phase. Conventional Mössbauer and NFS shows that the HAVAR is not magnetic at room temperature and no splitting is observed. The SQUID indicates a huge difference in the temperature dependence of the magnetic susceptibility between the cold Rolled HAVAR compared to the annealed HAVAR.

Original languageAmerican English
Pages (from-to)135-141
Number of pages7
JournalHyperfine Interactions
Volume197
Issue number1
DOIs
StatePublished - 2010
Externally publishedYes

Keywords

  • Crystallographic structure
  • Diamond anvil cell (DAC)
  • HAVAR
  • High-pressure
  • Magnetic properties

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