Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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High quality single crystals of a ferromagnetic superconductor URhGe were successfully grown. The electrical resistivity was measured for the field along b-axis in the orthorhombic crystal structure in order to study precisely its field re-entrant superconductivity which occurs in the vicinity of the field H_R, where the easy magnetization switches from c-to b-axis. The field re-entrant superconductivity of URhGe is analyzed with special focus on its dependence with the value of residual resistivity ρ_0 and the coefficient A of T^2 term of the resistivity. The experimental results are well explained by a crude model related with the field dependence of the effective mass m^*, where the corresponding critical temperature T_<sc>(m^*) and the upper critical field H_<c2> are strongly enhanced. Discussion is made on the interplay between magnetic and superconducting phase diagram as well as the link between T_<sc> and A in other heavy fermion superconductors.
社団法人日本物理学会の論文
2008-09-15