# Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe

Source: [Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe](<https://www.sota2.com/research/paper/68fa2d651e209131ce85913f>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T16:15:05.238Z

Authors: T. Hattori, K. Karube, Y. Ihara, K. Ishida, K. Deguchi, N. K. Sato, T. Yamamura

Published: 2013-08-27T04:00:15.000Z

## 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 \[Phys. Rev. B 81, 180504 (2010)\].

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1308.5749>)

[PDF](<https://arxiv.org/pdf/1308.5749.pdf>)