Volume 87, Number 1, July 2009
Article Number 17004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 23 July 2009
EPL, 87 (2009) 17004
DOI: 10.1209/0295-5075/87/17004

Pressure-induced superconductivity in BaFe2As2 single crystal

Awadhesh 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 $(T_{{\rm C}})$ is seen to increase upto a moderate pressure of about ~ 1.5 GPa and decreases monotonically beyond this pressure. The SDW transition temperature $T_{{\rm SDW}}$ 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