ANISOTROPIC PAIRING IN SUPERCONDUCTING SR2RUO4 - RU NMR AND NQR STUDIES

NMR and nuclear quadrupole resonance studies are reported on single-cr ystal Sr2RuO4 (T-c=0.7 K) with the same layered perovskite structure a s La2CuO4. The Pauli spin susceptibility deduced from the Ru Knight sh ift is found to be largely enhanced by a factor of similar to 5.4 as c ompared with the value from the band calculation. In the superconducti ng state, the nuclear spin-lattice relaxation rate 1/T-1 exhibits a sh arp decrease with no coherence peak just below T-c and the T1T=constan t behavior well below T-c, suggesting that the anisotropic pairing sta te is realized as in heavy-fermion and high-T-c superconductors.