Superconductivity reinforced by magnetic field and the magnetic instability in uranium ferromagnets

Dai Aoki, Tatsuma D. Matsuda, Frédéric Hardy, Christoph Meingast, Valentin Taufour, Elena Hassinger, Ilya Sheikin, Carley Paulsen, Georg Knebel, Hisashi Kotegawa, Jacques Flouquet

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

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 0 K are discussed in terms of the selfinduced 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.

Original languageEnglish
Article numberSA008
Journaljournal of the physical society of japan
Volume80
Issue numberSUPPL. A
DOIs
Publication statusPublished - 2011 Jul
Externally publishedYes

Keywords

  • Effective mass
  • Ferromagnetic instability
  • Ferromagnetism
  • Superconductivity
  • UCoGe
  • URhGe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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