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journal id: "physicalxreviewxletters"
| Authors | N.T. Huy, D.E. de Nijs, Y.K. Huang, A. de Visser | | Title | Unusual upper critical field of the ferromagnetic superconductor UCoGe |
| Journal | Physical Review Letters |
| Volume | 100 |
| Year | 2008 |
| Issue | 7 |
| Pages | 077002- |
| ISSN | 00319007 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Van der Waals-Zeeman Institute (WZI) |
| Abstract | 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. |
| Document type | Article |
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