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arXiv · 1308.5749

Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe

T. Hattori·K. Karube·Y. Ihara·K. Ishida·K. Deguchi·N. K. Sato·T. Yamamura
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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)].

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T. Hattori, K. Karube, Y. Ihara, K. Ishida, K. Deguchi, N. K. Sato, T. Yamamura. 2013-08-27. Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe. https://doi.org/10.1103/physrevb.88.085127

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