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  • Title: Phase transition and superconductivity of SrFe(2)As(2) under high pressure.
    Author: Uhoya WO, Montgomery JM, Tsoi GM, Vohra YK, McGuire MA, Sefat AS, Sales BC, Weir ST.
    Journal: J Phys Condens Matter; 2011 Mar 30; 23(12):122201. PubMed ID: 21389565.
    Abstract:
    High pressure x-ray diffraction and electrical resistance measurements have been carried out on SrFe(2)As(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(C) falls below 10 K in the pressure range of 10-18 GPa where the CT phase is expected to be stable.
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