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We report the impact of hydrostatic pressure on the superconductivity andnormal state resistivity of FeTe0.5Se0.5 superconductor. At the ambientpressure the FeTe0.5Se0.5 compound shows the superconducting transitiontemperature Tconset at above 13K and TcR=0 at 11.5K. We measure pressuredependent resistivity from 250K to 5K, which shows that the normal stateresistivity increases initially for the applied pressures of up to 0.55GPa andthen the same is decreased monotonically with increasing pressure of up to1.97GPa. On the other hand the superconducting transition temperatures (Tconsetand TcR=0) increase monotonically with increasing pressure. Namely the Tconsetincreases from 13K to 25K and TcR=0 from 11.5K to 20K for the pressures rangeof 0-1.97GPa. Our results suggest that superconductivity in this class ofFe-based compounds is very sensitive to pressure as the estimated pressurecoefficient dTc(onset)/dP is 5.8K/GPa. It may be suggested that FeTe0.5Se0.5superconductor is a strong electron correlated system. The enhancement of Tcwith applying pressure is mainly attributed to an increase of charge carriersat Fermi surface.

Superconductivity at 25K under hydrostatic pressure for FeTe0.5Se0.5 superconductor