Superconducting and ferromagnetic phase diagram of UCoGe probed by thermal expansion

A. M. Nikitin, J. J. Geldhof, Y. K. Huang, D. Aoki, A. De Visser

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2 Citations (Scopus)


We report thermal expansion measurements on a single crystal of the superconducting ferromagnet UCoGe for magnetic fields applied along the main orthorhombic axes. The thermal expansion cell was mounted on a piezoelectric rotator in order to fine-tune the magnetic field angle. The superconducting and magnetic phase diagram has been determined. With our bulk technique we confirm the S shape of the upper-critical field, Bc2, for B b and reinforcement of superconductivity above 6 T. At the same time the Curie point shifts towards lower temperatures on increasing the field along the b axis. This lends further support to theoretical proposals of spin-fluctuation-mediated reinforcement of superconductivity for B b.

Original languageEnglish
Article number115151
JournalPhysical Review B
Issue number11
Publication statusPublished - 2017 Mar 28


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