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

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.

Proceedings of ICHE2010, Tokyo

References in corpus (9)

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• Unusual upper critical field of the ferromagnetic superconductor UCoGe
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• Colossal enhancement of upper critical fields in noncentrosymmetric heavy fermion superconductors near quantum criticality: CeRhSi${}_3$ and CeIrSi${}_3$
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• The superconducting ferromagnet UCoGe
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Cited by in corpus (9)

• Ferromagnetism and Superconductivity in Uranium Compounds
• Field-angle dependence reveals odd-parity superconductivity in CeRh${}_2$As${}_2$
• Symmetry protected line nodes in non-symmorphic magnetic space groups: Applications to UCoGe and UPd${}_2$Al${}_3$
• p-wave superconductivity near a transverse saturation field
• Coexistence of two vector order parameters: a holographic model for ferromagnetic superconductivity
• Superconducting Gap of UCoGe probed by Thermal Transport
• Upper critical field in ferromagnetic metals with triplet pairing
• Angular variation of the magnetoresistance of the superconducting ferromagnet UCoGe
• Upper critical field of p-wave superconductors with orthorhombic symmetry