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.
@article{arxiv.1006.0065,
title = {The superconducting ferromagnet UCoGe},
author = {A. Gasparini and Y. K. Huang and N. T. Huy and J. C. P. Klaasse and T. Naka and E. Slooten and A. de Visser},
journal= {arXiv preprint arXiv:1006.0065},
year = {2015}
}
Comments
19 pages; review paper; accepted for publication in the Journal of Low Temperature Physics (Special issue: Quantum Phase Transitions 2010)