Superconducting and ferromagnetic phase diagram of UCoGe probed by thermal expansion

Abstract

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 piezo-electric 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, $B_{c2}$, for $B\parallel b$ 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 $B\parallel b$.

7 pages, 7 figures

References in corpus (10)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds
• Anisotropic magnetic fluctuations in the ferromagnetic superconductor UCoGe studied by angle-resolved ^{59}Co NMR
• On the theory of superconductivity in ferromagnetic superconductors with triplet pairing
• Properties of Ferromagnetic Superconductors
• Reentrant superconductivity in URhGe
• Quantum Criticality in the Ferromagnetic Superconductor UCoGe under Pressure and Magnetic Field
• Magnetism and Superconductivity in Ferromagnetic Heavy Fermion System UCoGe under In-plane Magnetic Fields
• Superconductivity in Uranium Compounds

Cited by in corpus (3)

• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Vortex liquid phase in the p-wave ferromagnetic superconductor UCoGe
• Magnetoelastic coupling at the field-induced transition in EuAl${}_{12}$O${}_{19}$