Upper critical field in superconductors near ferromagnetic quantum critical points; UCoGe

Details Upper critical field in superconductors near ferromagnetic quantum critical points; UCoGe Upper critical field in superconductors near ferromagnetic quantum critical points; UCoGe

2010-08-25

arxiv.org/abs/1008.4204v1

Physics

Condensed Matter

Superconductivity

Proceedings of ICHE2010, Tokyo

Scientific paper

We study the strong-coupling superconductivity near ferromagnetic quantum critical points, mainly focusing on the upper critical fields $H_{c2}$. Based on our simple model calculations, we discuss experimentally observed unusual behaviors of $H_{c2}$ in a recently discovered ferromagnetic superconductor UCoGe. Especially, the large anisotropy between $H_{c2}\parallel a$-axis and $H_{c2}\parallel c$-axis, and the strong-coupling behaviors in $H_{c2}^{\parallel a}$ are investigated. We also examine effects of non-analytic corrections in the spin susceptibility on the superconductivity, which can arise from effective long range interactions due to particle-hole excitations.

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