Table of Contents
Physics Research International
Volume 2014, Article ID 454939, 7 pages
Research Article

Multigap Superconductivity in the Ferromagnetic Superconductor UCoGe Revealed by Thermal Conductivity Measurements

1Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
2Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland
3Institut Nanosciences et Cryogénie, Commissariat à l’Énergie Atomique et aux Énergies Alternatives, 38054 Grenoble, France
4University Joseph Fourier, 38041 Grenoble, France
5Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan

Received 7 July 2014; Revised 15 September 2014; Accepted 17 September 2014; Published 9 October 2014

Academic Editor: Zhiqiang Mao

Copyright © 2014 Ludovic Howald et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We performed thermal conductivity measurements on a single crystal of the ferromagnetic superconductor UCoGe under magnetic field. Two different temperature dependencies of the thermal conductivity are observed, for : linear at low magnetic field and quadratic for magnetic field larger than 1 Tesla. At the same field value, a plateau appears in the field dependency of the residual term of thermal conductivity. Such observations suggest a multigap superconductivity with a line of nodes in the superconducting gap.