Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-09
J. Phys. Soc. Jpn. 80 (2011) SA008
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 9 figures, proceedings of ICHE2010 in Tokyo, to be published in J. Phys. Soc. Jpn. Suppl
Scientific paper
We review our recent results on ferromagnetic superconductors, URhGe and UCoGe. High quality single crystals of both compounds were successfully grown. The specific heat shows a clear jump related to the superconducting transition in UCoGe. The finite values of C/T at 0K are discussed in terms of the self-induced vortex state and the value of the ordered moment. With increasing fields for H // b-axis in URhGe, the jump of thermal expansion increases and shifts to lower temperature. The re-entrant and S-shaped superconducting phases for URhGe and UCoGe respectively are explained by the unusual field dependence of the effective mass, which is induced by the ferromagnetic instability when the field is applied along the hard magnetization b-axis. The magnetic fluctuations are very sensitive to the field orientation. This is reflected in the Hc2 and the anisotropy of the effective mass.
Aoki Dai
Flouquet Jacques
Hardy Frederic
Hassinger Elena
Knebel Georg
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