Possible two-band superconductivity in PuRhGa5 and CeRhIn5

[摘要] Measurements of the upper critical field H-c2 Of the Pu-based heavy-fermion superconductor PuRhGa5 have been made using a torque magnetometer at temperatures down to 0.6 K and magnetic fields up to 17T along the principal axes of the tetragonal structure. A linear temperature dependence of H-c2 down to T-c/10 for H parallel to c and to T-c/2 for H parallel to ab is observed. While the data appear to be inconsistent with both purely Pauli limiting or orbital effects governing the upper critical field, the linear T-dependence of H-c2 is well described by a two-band model of superconductivity involving coupled bands of heavy and light electrons. A close similarity between PuRhGa5 and the pressure-induced antiferromagnetic isostructural superconductor CeRhIn5 is also found. Published by Elsevier B.V.

[发布日期] 2009-12-04

[效力级别]  Proceedings Paper

[关键词] Actinide alloys and materials;Superconductors;Heavy fermions;Lanthanide alloys and materials