Pressure shift of the superconducting Tc of LiFeAsM. Gooch1, B. Lv2, J. H. Tapp2, Z. Tang2, B. Lorenz1, A. M. Guloy2 and P. C. W. Chu1, 3, 4
1 TCSUH and Department of Physics, University of Houston - Houston, TX 77204, USA
2 TCSUH and Department of Chemistry, University of Houston - Houston, TX 77204, USA
3 Lawrence Berkeley National Laboratory - 1 Cyclotron Road, Berkeley, CA 94720, USA
4 Hong Kong University of Science and Technology - Hong Kong, China
received 6 December 2008; accepted in final form 17 December 2008; published January 2009
published online 28 January 2009
The effect of hydrostatic pressure on the superconductivity in LiFeAs is investigated up to 1.8 GPa. The superconducting transition temperature, Tc, decreases linearly with pressure at a rate of 1.5 K/GPa. The negative pressure coefficient of Tc and the high ambient pressure Tc indicate that LiFeAs is the high-pressure analogue of the isoelectronic SrFe2As2 and BaFe2As2.
74.25.Dw - Superconductivity phase diagrams.
74.62.Fj - Pressure effects.
74.70.Dd - Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.).
© EPLA 2009