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

Yasuhiro Tada; Norio Kawakami; Satoshi Fujimoto

doi:10.1143/JPSJS.80SA.SA006

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

Superconductivity 2015-05-19 v1 Strongly Correlated Electrons

Authors: Yasuhiro Tada , Norio Kawakami , Satoshi Fujimoto

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Abstract

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.

Keywords

upper critical field ferromagnetic quantum critical point strong-coupling superconductivity UCoGe anisotropy spin susceptibility

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@article{arxiv.1008.4204,
  title  = {Upper critical field in superconductors near ferromagnetic quantum critical points; UCoGe},
  author = {Yasuhiro Tada and Norio Kawakami and Satoshi Fujimoto},
  journal= {arXiv preprint arXiv:1008.4204},
  year   = {2015}
}

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Proceedings of ICHE2010, Tokyo

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

Abstract

Keywords

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