Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe

TL;DR

This study uses ^{59}Co NMR Knight shift measurements to investigate the spin susceptibility in the superconducting state of UCoGe, revealing evidence for equal-spin pairing and excluding spin-singlet pairing.

Contribution

It provides experimental evidence supporting equal-spin pairing in UCoGe through NMR measurements, clarifying the nature of its superconducting pairing state.

Findings

Knight shift remains constant below superconducting transition

Excludes spin-singlet pairing in UCoGe

Supports equal-spin pairing with large exchange field

Abstract

In order to determine the superconducting paring state in the ferromagnetic superconductor UCoGe, ^{59}Co NMR Knight shift, which is directly related to the microscopic spin susceptibility, was measured in the superconducting state under magnetic fields perpendicular to spontaneous magnetization axis: ^{59}K^{a, b}. ^{59}K^{a, b} shows to be constant, but does not decrease below a superconducting transition. These behaviors as well as the invariance of the internal field at the Co site in the superconducting state exclude the spin-singlet pairing, and can be interpreted with the equal-spin pairing state with a large exchange field along the c axis, which was studied by Mineev [Phys. Rev. B 81, 180504 (2010)].