Abstract
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 H→∥b→: 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.
Highlights
The orthorhombic heavy fermion system UCoGe, discovered in 2007 [1], is one of the few compounds exhibiting long range coexistence between weak itinerant ferromagnetism and superconductivity
We found that the magnetic contribution is independent of a magnetic field applied along the b⃗ crystallographic direction while it is strongly reduced by a magnetic field applied in the c⃗ crystallographic direction, as expected for longitudinal spin fluctuations [18] and in agreement with a previous study using a different technique to extract the magnetic contribution [26]
With the study of thermal conductivity (κ(T, H)) in the ferromagnetic heavy fermion system UCoGe, we confirm the reenforcement of superconductivity under magnetic field and establish the bulk character of this effect
Summary
The orthorhombic heavy fermion system UCoGe, discovered in 2007 [1], is one of the few compounds exhibiting long range coexistence between weak itinerant ferromagnetism (magnetic moment m0 ≅ 0.07μB [2]) and superconductivity. Such coexistence is attested by the observation of two bulk phase transitions in specific heat measurements [1]. We report evidences for multigap superconductivity in the ferromagnetic superconductor UCoGe
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