Muon spin rotation and relaxation in the superconducting ferromagnet UCoGe

Details Muon spin rotation and relaxation in the superconducting ferromagnet UCoGe Muon spin rotation and relaxation in the superconducting ferromagnet UCoGe

2009-04-03

arxiv.org/abs/0904.0532v1

Phys. Rev. Lett. 102 (2009) 167003-1:4.

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, accepted for publication in PRL

Scientific paper

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.

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