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Title: High-pressure structural phase transitions in chromium-doped BaFe[subscript 2]As[subscript 2]

Abstract

We report on the results from high pressure x-ray powder diffraction and electrical resistance measurements for hole doped BaFe{sub 2-x}Cr{sub x}As{sub 2} (x = 0, 0.05, 0.15, 0.4, 0.61) up to 81 GPa and down to 10 K using a synchrotron source and diamond anvil cell (DAC). At ambient temperature, an isostructural phase transition from a tetragonal (T) phase (I4/mmm) to a collapsed tetragonal (CT) phase is observed at 17 GPa. This transition is found to be dependent on ambient pressure unit cell volume and is slightly shifted to higher pressure upon increase in the Cr-doping. Unlike BaFe{sub 2}As{sub 2} which superconduct under high pressure, we have not detected any evidence of pressure induced superconductivity in chromium doped samples in the pressure and temperature range of this study. The measured equation of state parameters are presented for both the tetragonal and collapsed tetragonal phases for x = 0.05, 0.15, 0.40 and 0.61.

Authors:
; ; ; ; ; ;  [1];  [2];  [2]
  1. (UAB)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESOTHER U.S. GOVERNMENT
OSTI Identifier:
1048959
Resource Type:
Journal Article
Journal Name:
J. Phys. Conf. Series
Additional Journal Information:
Journal Volume: 377; Journal Issue: (1) ; 2012; Conference: Mumbai, India
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMBIENT TEMPERATURE; CHROMIUM; DIAMONDS; DIFFRACTION; ELECTRIC CONDUCTIVITY; SUPERCONDUCTIVITY; SYNCHROTRONS

Citation Formats

Uhoya, W.O., Montgomery, J.M., Samudrala, G.K., Tsoi, G.M., Vohra, Y.K., Weir, S.T., Sefat, A.S., LLNL), and ORNL). High-pressure structural phase transitions in chromium-doped BaFe[subscript 2]As[subscript 2]. United States: N. p., 2012. Web. doi:10.1088/1742-6596/377/1/012016.
Uhoya, W.O., Montgomery, J.M., Samudrala, G.K., Tsoi, G.M., Vohra, Y.K., Weir, S.T., Sefat, A.S., LLNL), & ORNL). High-pressure structural phase transitions in chromium-doped BaFe[subscript 2]As[subscript 2]. United States. doi:10.1088/1742-6596/377/1/012016.
Uhoya, W.O., Montgomery, J.M., Samudrala, G.K., Tsoi, G.M., Vohra, Y.K., Weir, S.T., Sefat, A.S., LLNL), and ORNL). Tue . "High-pressure structural phase transitions in chromium-doped BaFe[subscript 2]As[subscript 2]". United States. doi:10.1088/1742-6596/377/1/012016.
@article{osti_1048959,
title = {High-pressure structural phase transitions in chromium-doped BaFe[subscript 2]As[subscript 2]},
author = {Uhoya, W.O. and Montgomery, J.M. and Samudrala, G.K. and Tsoi, G.M. and Vohra, Y.K. and Weir, S.T. and Sefat, A.S. and LLNL) and ORNL)},
abstractNote = {We report on the results from high pressure x-ray powder diffraction and electrical resistance measurements for hole doped BaFe{sub 2-x}Cr{sub x}As{sub 2} (x = 0, 0.05, 0.15, 0.4, 0.61) up to 81 GPa and down to 10 K using a synchrotron source and diamond anvil cell (DAC). At ambient temperature, an isostructural phase transition from a tetragonal (T) phase (I4/mmm) to a collapsed tetragonal (CT) phase is observed at 17 GPa. This transition is found to be dependent on ambient pressure unit cell volume and is slightly shifted to higher pressure upon increase in the Cr-doping. Unlike BaFe{sub 2}As{sub 2} which superconduct under high pressure, we have not detected any evidence of pressure induced superconductivity in chromium doped samples in the pressure and temperature range of this study. The measured equation of state parameters are presented for both the tetragonal and collapsed tetragonal phases for x = 0.05, 0.15, 0.40 and 0.61.},
doi = {10.1088/1742-6596/377/1/012016},
journal = {J. Phys. Conf. Series},
number = (1) ; 2012,
volume = 377,
place = {United States},
year = {2012},
month = {10}
}