Muon spin rotation and relaxation in the superconducting ferromagnet UCoGe

Abstract

We report zero-field muon spin rotation and relaxation measurements on the superconducting ferromagnet UCoGe. Weak itinerant ferromagnetic order is detected by a spontaneous muon spin precession frequency below the Curie temperature $T_C=3$ K. The ${\mu }^{+}$ precession frequency persists below the bulk superconducting transition temperature $T_{sc}=0.5$ K, where it measures a local magnetic field $B_{loc}=0.015$ T. The amplitude of the $\mu$SR signal provides unambiguous proof for ferromagnetism present in the whole sample volume. We conclude ferromagnetism coexists with superconductivity on the microscopic scale.

4 pages, 3 figures, accepted for publication in PRL

References in corpus (3)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Ferromagnetic order in U(Rh,Co)Ge

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