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Unusual upper critical field of the ferromagnetic superconductor UCoGe by Huy, N. T.; de Nijs, D. E.; Huang, Y. K.; de Visser, A. is a scholarly article available to read on EtoBox.

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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.

Author

Huy, N. T.; de Nijs, D. E.; Huang, Y. K.; de Visser, A.

Published

2008

Language

EN