- Unusual upper critical field of the ferromagnetic superconductor UCoGe
- Physical Review Letters
- Volume | Issue number
- 100 | 7
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
We report upper critical field B-c2(T) measurements on a single-crystalline sample of the ferromagnetic superconductor UCoGe. B-c2(0) obtained for fields applied along the orthorhombic axes exceeds the Pauli limit for B parallel to a,b and shows a strong anisotropy B-c2(a)similar or equal to B-c2(b)> B-c2(c). This provides evidence for an equal-spin pairing state and a superconducting gap function of axial symmetry with point nodes along the c axis, which is also the direction of the uniaxial ferromagnetic moment m(0)=0.07 mu(B). An unusual curvature or kink is observed in the temperature variation of B-c2, which possibly indicates UCoGe is a two-band ferromagnetic superconductor.
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