Abstract
High pressure x-ray diffraction and electrical resistance measurements have been carried out onSrFe2As2 to a pressure of 23 GPa and temperature of 10 K using a synchrotron source and designerdiamond anvils. At ambient temperature, a phase transition from the tetragonal phase to acollapsed tetragonal (CT) phase is observed at 10 GPa under non-hydrostatic conditions.The experimental relation that T–CT transition pressure for 122 Fe-based superconductorsis dependent on ambient pressure volume is affirmed. The superconducting transitiontemperature is observed at 32 K at 1.3 GPa and decreases rapidly with a further increase ofpressure in the region where the T–CT transition occurs. Our results suggest thatTC falls below 10 K in the pressure range of 10–18 GPa where the CT phase is expected to bestable.
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