Phase transition and superconductivity of SrFe2As2 under high pressure

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Journal of Physics: Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/23/12/122201· OSTI ID:1010596

Uhoya, Walter ^[1]; Montgomery, Jeffrey M ^[1]; Tsoi, Georgiy ^[1]; Vohra, Yogesh ^[1]; McGuire, Michael A ^[2]; Sefat, A. S. ^[3]; Sales, Brian C ^[2]; Weir, S. T. ^[4]

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1. University of Alabama, Birmingham
2. ORNL
3. Oak Ridge National Laboratory (ORNL)
4. Lawrence Livermore National Laboratory (LLNL)

High pressure x-ray diffraction and electrical resistance measurements have been carried out on SrFe{sub 2}As{sub 2} to a pressure of 23 GPa and temperature of 10 K using a synchrotron source and designer diamond anvils. At ambient temperature, a phase transition from the tetragonal phase to a collapsed tetragonal (CT) phase is observed at 10 GPa under non-hydrostatic conditions. The experimental relation that T-CT transition pressure for 122 Fe-based superconductors is dependent on ambient pressure volume is affirmed. The superconducting transition temperature is observed at 32 K at 1.3 GPa and decreases rapidly with a further increase of pressure in the region where the T-CT transition occurs. Our results suggest that T{sub C} falls below 10 K in the pressure range of 10-18 GPa where the CT phase is expected to be stable.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1010596
• Journal Information: Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Journal Issue: 12 Vol. 23; ISSN 0953-8984
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMBIENT TEMPERATURE
ARSENIDES
DIAMONDS
ELECTRIC CONDUCTIVITY
IRON COMPOUNDS
PRESSURE RANGE
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNCHROTRONS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION