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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 16
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Phys. Rev. Lett. 102, 167003 (2009) [4 pages]

Muon Spin Rotation and Relaxation in the Superconducting Ferromagnet UCoGe

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A. de Visser1,*, N. T. Huy1,†, A. Gasparini1, D. E. de Nijs1, D. Andreica2,‡, C. Baines2, and A. Amato2
1Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands
2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

Received 11 September 2008; published 22 April 2009

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 TC=3  K. The μ+ precession frequency persists below the bulk superconducting transition temperature Tsc=0.5  K, where it measures a local magnetic field Bloc=0.015  T. The amplitude of the μSR signal provides unambiguous proof for ferromagnetism present in the whole sample volume. We conclude ferromagnetism coexists with superconductivity on the microscopic scale.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.167003
DOI:
10.1103/PhysRevLett.102.167003
PACS:
74.70.Tx, 75.30.Kz, 76.75.+i

*a.devisser@uva.nl

†Current address: Hanoi Advanced School of Science and Technology, Hanoi University of Technology, 1 Dai Co Viet, Hanoi, Vietnam.

‡Current address: Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.

 
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