The superconducting ferromagnet UCoGe
A. Gasparini, Y.K. Huang, N.T. Huy, J.C.P. Klaasse, T. Naka, E., Slooten, A. de Visser
TL;DR
UCoGe is a unique material that exhibits coexistence of ferromagnetism and superconductivity mediated by spin fluctuations, with evidence suggesting p-wave pairing.
Contribution
This paper reviews the thermal, magnetic, and transport properties of UCoGe, providing evidence for its coexistence of ferromagnetism and superconductivity and proposing a p-wave pairing mechanism.
Findings
Superconductivity and ferromagnetism coexist below 0.6 K.
Superconductivity is mediated by ferromagnetic spin fluctuations.
UCoGe is likely a p-wave superconductor.
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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