Abstract
Knight shift of 99Ru ( 99K) has been measured in the superconducting (SC) state of Sr 2RuO 4 with T c∼1.5 K. The spin component of 99K is negative and approximately one order of magnitude larger than that of 17O Knight shift ( 17K) in the RuO 2 plane, indicating that the Ru site feels a stronger hyperfine field originating from Ru-4d electrons. 99K parallel to the RuO 2 plane shows no change in the SC state, in agreement with the previous 17K results. The invariance of the spin susceptibility at both Ru and O sites in the SC state gives the decisive evidence that SC pairs are in the spin-triplet state with the SC d -vector perpendicular to the RuO 2 plane.
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