Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe

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)].

5 pages, 4 figures, to be appear in PRB

References in corpus (5)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Anisotropic magnetic fluctuations in the ferromagnetic superconductor UCoGe studied by angle-resolved ^{59}Co NMR
• High-field moment polarization in the ferromagnetic superconductor UCoGe

Cited by in corpus (8)

• Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds
• Anisotropic response of spin susceptibility in the superconducting state of UTe${}_2$ probed with ${}^{125}$Te-NMR measurement
• Relationship between Ferromagnetic Criticality and the Enhancement of Superconductivity Induced by Transverse Magnetic Fields in UCoGe
• Phase diagram of UCoGe
• Superconducting Gap of UCoGe probed by Thermal Transport
• Paramagnetic effects of j-electron superconductivity and application to UTe2
• Towards a Microscopic Theory of the Knight Shift in an Anisotropic, Multiband Type-II Superconductor
• Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice