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

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 th...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2008-09, Vol.77 (9), p.94709
Main Authors: MIYAKE, Atsushi, AOKI, Dai, FLOUQUET, Jacques
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Phase diagrams
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary: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 HR, 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 ρ0 and the coefficient A of T2 term of the resistivity. The experimental results are well explained by a crude model related with the field dependence of the effective mass m[low *], where the corresponding critical temperature Tsc(m[low *]) and the upper critical field Hc2 are strongly enhanced. Discussion is made on the interplay between magnetic and superconducting phase diagram as well as the link between Tsc and A in other heavy fermion superconductors.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.77.094709