Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-01-14
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures, proceedings of TOKIMEKI2011, to be published in J. Phys. Soc. Jpn. Suppl
Scientific paper
We review our recent studies on ferromagnetic superconductors, UGe2, URhGe and UCoGe, where the spin-triplet state with the so-called equal spin pairing is realized. We focus on experimental results of URhGe and UCoGe in which the superconductivity occurs already at ambient pressure. The huge upper critical field Hc2 on UCoGe for the field along the hard magnetization axis (b-axis) is confirmed by the AC susceptibility measurements by the fine tuning of field angle. Contrary to the huge Hc2 along the hard-magnetization axis, Hc2 along the easy-magnetization axis (c-axis) is relatively small in value. However, the initial slope of Hc2, namely dHc2/dT (H -> 0) both in UCoGe and in URhGe indicates the large value, which can be explained by the magnetic domain effect detected in the magnetization measurements. The specific heat measurements using a high quality single crystal of UCoGe demonstrate the bulk superconductivity, which is extended under magnetic field for the field along c-axis.
Aoki Dai
Brison Jean-Pascal
Flouquet Jacques
Hardy Frederic
Hassinger Elena
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