The Superconducting Ferromagnet UCoGe

Abstract

The correlated metal UCoGe is a weak itinerant ferromagnet with a Curie temperature T C=3 K and a superconductor with a transition temperature T s=0.6 K. We review its basic thermal, magnetic—on the macro and microscopic scale—and transport properties, as well as the response to high pressure. The data unambiguously show that superconductivity and ferromagnetism coexist below T s=0.6 K and are carried by the same 5f electrons. We present evidence that UCoGe is a p-wave superconductor and argue that superconductivity is mediated by critical ferromagnetic spin fluctuations.

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Correspondence to A. de Visser.

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Gasparini, A., Huang, Y.K., Huy, N.T. et al. The Superconducting Ferromagnet UCoGe. J Low Temp Phys 161, 134–147 (2010). https://doi.org/10.1007/s10909-010-0188-1

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Keywords

  • Superconducting ferromagnet
  • p-wave superconductor
  • Magnetic quantum critical point
  • Critical spin fluctuations