Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe

Abstract

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 $H_{\mathrm{R}}$, 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 ${\rho }_0$ 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 $m^{\ast }$, where the corresponding critical temperature $T_{\mathrm{sc}}(m^{\ast })$ 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 $T_{\mathrm{sc}}$ and $A$ in other heavy fermion superconductors.

arXiv comment6pages, 7 figures, to be published in J. Phys. Soc. Jpn. No.9 (2008)

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