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Title: Multiferroic CuCrO₂ under high pressure: In situ X-ray diffraction and Raman spectroscopic studies

Abstract

The compression behavior of delafossite compound CuCrO₂ has been investigated by in situ x-ray diffraction (XRD) and Raman spectroscopic measurements up to 23.2 and 34 GPa, respectively. X-ray diffraction data show the stability of ambient rhombohedral structure up to ~23 GPa. Material shows large anisotropy in axial compression with c-axis compressibility, κ{sub c} = 1.26 × 10⁻³(1) GPa⁻¹ and a-axis compressibility, κ{sub a} = 8.90 × 10⁻³(6) GPa⁻¹. Our XRD data show an irreversible broadening of diffraction peaks. Pressure volume data when fitted to 3rd order Birch-Murnaghan equation of state give the value of bulk modulus, B₀ = 156.7(2.8) GPa with its pressure derivative, B₀{sup ’} as 5.3(0.5). All the observed vibrational modes in Raman measurements show hardening with pressure. Appearance of a new mode at ~24 GPa indicates the structural phase transition in the compound. Our XRD and Raman results indicate that CuCrO{sub 2} may be transforming to an ordered rocksalt type structure under compression.

Authors:
; ;  [1]
  1. High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
Publication Date:
OSTI Identifier:
22305747
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 116; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; CHROMITES; COMPRESSIBILITY; COMPRESSION; COPPER COMPOUNDS; EQUATIONS OF STATE; HARDENING; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; RAMAN SPECTRA; STABILITY; TRIGONAL LATTICES; X-RAY DIFFRACTION

Citation Formats

Garg, Alka B., E-mail: alkagarg@barc.gov.in, Mishra, A. K., Pandey, K. K., and Sharma, Surinder M. Multiferroic CuCrO₂ under high pressure: In situ X-ray diffraction and Raman spectroscopic studies. United States: N. p., 2014. Web. doi:10.1063/1.4896952.
Garg, Alka B., E-mail: alkagarg@barc.gov.in, Mishra, A. K., Pandey, K. K., & Sharma, Surinder M. Multiferroic CuCrO₂ under high pressure: In situ X-ray diffraction and Raman spectroscopic studies. United States. https://doi.org/10.1063/1.4896952
Garg, Alka B., E-mail: alkagarg@barc.gov.in, Mishra, A. K., Pandey, K. K., and Sharma, Surinder M. 2014. "Multiferroic CuCrO₂ under high pressure: In situ X-ray diffraction and Raman spectroscopic studies". United States. https://doi.org/10.1063/1.4896952.
@article{osti_22305747,
title = {Multiferroic CuCrO₂ under high pressure: In situ X-ray diffraction and Raman spectroscopic studies},
author = {Garg, Alka B., E-mail: alkagarg@barc.gov.in and Mishra, A. K. and Pandey, K. K. and Sharma, Surinder M.},
abstractNote = {The compression behavior of delafossite compound CuCrO₂ has been investigated by in situ x-ray diffraction (XRD) and Raman spectroscopic measurements up to 23.2 and 34 GPa, respectively. X-ray diffraction data show the stability of ambient rhombohedral structure up to ~23 GPa. Material shows large anisotropy in axial compression with c-axis compressibility, κ{sub c} = 1.26 × 10⁻³(1) GPa⁻¹ and a-axis compressibility, κ{sub a} = 8.90 × 10⁻³(6) GPa⁻¹. Our XRD data show an irreversible broadening of diffraction peaks. Pressure volume data when fitted to 3rd order Birch-Murnaghan equation of state give the value of bulk modulus, B₀ = 156.7(2.8) GPa with its pressure derivative, B₀{sup ’} as 5.3(0.5). All the observed vibrational modes in Raman measurements show hardening with pressure. Appearance of a new mode at ~24 GPa indicates the structural phase transition in the compound. Our XRD and Raman results indicate that CuCrO{sub 2} may be transforming to an ordered rocksalt type structure under compression.},
doi = {10.1063/1.4896952},
url = {https://www.osti.gov/biblio/22305747}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 13,
volume = 116,
place = {United States},
year = {2014},
month = {10}
}