The evolution of pressure-induced superconductivity in single crystal as well as polycrystalline samples of BaF e 2 As 2 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 ( T C ) is seen to increase upto a moderate pressure of about ∼1.5 GPa and decreases monotonically beyond this pressure. The SDW transition temperature T SDW decreases rapidly with increasing pressure and vanishes above ∼1.5 GPa.
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Mani et al. (2009) studied this question.
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