Physics – Condensed Matter – Superconductivity
Scientific paper
2008-01-17
Phys. Rev. Lett. 100 (2008) 077001-1:4.
Physics
Condensed Matter
Superconductivity
4 pages, accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.100.077002
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 $B \parallel a,b$ and shows a strong anisotropy $B_{c2}^{a} \simeq B_{c2}^{b} \gg B_{c2} ^{c}$. This provide 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.
de Nijs D. E.
Huang Yue-Kai
Huy Nguyen Thanh
Visser Anne de
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