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

Journal Article · Tue Oct 23 04:00:00 EDT 2012 · J. Phys. Conf. Series

DOI:https://doi.org/10.1088/1742-6596/377/1/012016· OSTI ID:1048959

Uhoya, W O; Montgomery, J M; Samudrala, G K; Tsoi, G M; Vohra, Y K; Weir, S T; Sefat, A S ^[1]

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1. UAB

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.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: DOE - BASIC ENERGY SCIENCESOTHER U.S. GOVERNMENT
• OSTI ID: 1048959
• Journal Information: J. Phys. Conf. Series, Journal Name: J. Phys. Conf. Series Journal Issue: (1) ; 2012 Vol. 377
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMBIENT TEMPERATURE
CHROMIUM
DIAMONDS
DIFFRACTION
ELECTRIC CONDUCTIVITY
SUPERCONDUCTIVITY
SYNCHROTRONS