title: Anisotropic magnetic fluctuations in the ferromagnetic superconductor UCoGe studied by direction-dependent 59Co NMR measurements.
abstract: We have carried out direction-dependent 59Co NMR experiments on a single crystal sample of the ferromagnetic superconductor UCoGe in order to study the magnetic properties in the normal state. The Knight-shift and nuclear spin-lattice relaxation rate measurements provide microscopic evidence that both static and dynamic susceptibilities are ferromagnetic with strong Ising anisotropy. We discuss that superconductivity induced by these magnetic fluctuations prefers spin-triplet pairing state.
authors.affiliation: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. ihara@scphys.kyoto-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Ihara
authors.forename: T
authors.initials: T
authors.lastname: Hattori
authors.forename: K
authors.initials: K
authors.lastname: Ishida
authors.forename: Y
authors.initials: Y
authors.lastname: Nakai
authors.forename: E
authors.initials: E
authors.lastname: Osaki
authors.forename: K
authors.initials: K
authors.lastname: Deguchi
authors.forename: N K
authors.initials: NK
authors.lastname: Sato
authors.forename: I
authors.initials: I
authors.lastname: Satoh