NMR and NQR studies on superconducting Sr2RuO4 |
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Authors: | Kenji Ishida Hiroshi Murakawa Yoshio Kitaoka Yoshiteru Maeno |
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Affiliation: | a Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan b Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8502, Japan |
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Abstract: | We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr2RuO4, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1/T1) of a high-quality sample with shows a sharp decrease without a coherence peak just below Tc, followed by a T3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr2RuO4 is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe. |
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Keywords: | 74.25.&minus q 74.20.Mn 76.60.Gv |
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