Pressure-induced superconductivity in BaFe2As2 single crystalAwadhesh Mani, Nilotpal Ghosh, S. Paulraj, A. Bharathi and C. S. Sundar
Materials Science Group, Indira Gandhi Centre for Atomic Research - Kalpakkam, 603102, Tamilnadu, India
received 25 March 2009; accepted in final form 24 June 2009; published July 2009
published online 23 July 2009
The evolution of pressure-induced superconductivity in single crystal as well as polycrystalline samples of BaFe2As2 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 is seen to increase upto a moderate pressure of about ~ 1.5 GPa and decreases monotonically beyond this pressure. The SDW transition temperature decreases rapidly with increasing pressure and vanishes above ~ 1.5 GPa.
74.62.Fj - Pressure effects.
74.70.Dd - Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.).
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
© EPLA 2009