Collapsed tetragonal phase and superconductivity of BaFe[subscript 2]As[subscript 2] under high pressure

Journal Article · Fri Nov 12 04:00:00 EST 2010 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.82.144118· OSTI ID:1002820

Uhoya, Walter; Stemshorn, Andrew; Tsoi, Georgiy; Vohra, Yogesh K; Sefat, Athena S; Sales, Brian C; Hope, Kevin M; Weir, Samuel T ^[1]

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1. UAB

High pressure x-ray diffraction and electrical resistance measurements have been carried out on BaFe{sub 2}As{sub 2} to a pressure of 35 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 17 GPa under nonhydrostatic conditions as compared to 22 GPa under hydrostatic conditions. The superconducting transition temperature increases rapidly with pressure up to 34 K at 1 GPa and decreases gradually with a further increase in pressure. Our results suggest that T{sub C} falls below 10 K in the pressure range of 16-30 GPa, where CT phase is expected to be stable under high-pressure and low-temperature conditions.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1002820
• Journal Information: Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: (14) ; 10, 2010 Vol. 82
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
AMBIENT TEMPERATURE
DIAMONDS
ELECTRIC CONDUCTIVITY
HYDROSTATICS
PRESSURE RANGE
SUPERCONDUCTIVITY
SYNCHROTRONS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION