High-pressure structural phase transitions in chromium-doped BaFe2As2

We report on the results from high pressure x-ray powder diffraction and electrical resistance measurements for hole doped BaFe2-xCrxAs2 (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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.377 (1)
Main Authors: Uhoya, W O, Montgomery, J M, Samudrala, G K, Tsoi, G M, Vohra, Y K, Weir, S T, Sefat, A S
Format: Article
Language:English
Subjects:
AMBIENT TEMPERATURE
CHROMIUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Diamond anvil cells
DIAMONDS
DIFFRACTION
ELECTRIC CONDUCTIVITY
Equations of state
Phase transitions
Physics
Pressure dependence
SUPERCONDUCTIVITY
SYNCHROTRONS
Unit cell
X ray powder diffraction
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Summary:We report on the results from high pressure x-ray powder diffraction and electrical resistance measurements for hole doped BaFe2-xCrxAs2 (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 BaFe2As2 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.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/377/1/012016