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Abstract
We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr 2RuO 4, 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 / T 1 ) of a high-quality sample with T c ∼ 1.5 K shows a sharp decrease without a coherence peak just below T c , followed by a T 3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr 2RuO 4 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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