Superconductivity on the border of weak itinerant ferromagnetism in UCoGe

Abstract

We report the coexistence of ferromagnetic order and superconductivity in UCoGe at ambient pressure. Magnetization measurements show that UCoGe is a weak ferromagnet with a Curie temperature TC=3K and a small ordered moment m0=0.03μB. Superconductivity is observed with a resistive transition temperature Ts=0.8K for the best sample. Thermal-expansion and specific-heat measurements provide solid evidence for bulk magnetism and superconductivity. The proximity to a ferromagnetic instability, the defect sensitivity of Ts, and the absence of Pauli limiting, suggest triplet superconductivity mediated by critical ferromagnetic fluctuations. © 2007 The American Physical Society.