Pressure-induced superconductivity in BaFe2As2 single crystal
The evolution of pressure-induced superconductivity in single crystal as well as polycrystalline samples of BaF e2As2 have been investigated through temperature-dependent electrical resistivity studies in the 0–7 GPa pressure range. While the superconducting transition remains incomplete in the polycrystalline sample, a clear pressure-induced superconductivity with zero resistivity at the expense of magnetic transition, associated with spin density wave (SDW), is observed in the single-crystal sample. The superconducting transition temperature (TC) is seen to increase upto a moderate pressure of about ~1.5 GPa and decreases monotonically beyond this pressure. The SDW transition temperature TSDW decreases rapidly with increasing pressure and vanishes above ~1.5 GPa.