Field-induced phenomena in ferromagnetic superconductors UCoGe and URhGe

Dai Aoki, Mathieu Taupin, Carley Paulsen, Frédéric Hardy, Valentin Taufour, Hisashi Kotegawa, Elena Hassinger, Liam Malone, Tatsuma D. Matsuda, Atsushi Miyake, Ilya Sheikin, William Knafo, Georg Knebel, Ludovic Howald, Jean Pascal Brison, Jacques Flouquet

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4 Citations (Scopus)


We review our recent studies on ferromagnetic superconductors, UGe 2, 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 H c2, 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.

Original languageEnglish
Article numberSB002
JournalJournal of the Physical Society of Japan
Issue numberSUPPL.B
Publication statusPublished - 2012 Sept


  • AC susceptibility
  • Ferromagnetism
  • Magnetization
  • Resistivity
  • Specific heat
  • Superconducting upper critical field
  • Superconductivity
  • Uranium compound


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