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Quite recently, a pronounced drop of $^{17}$O NMR Knight shift in thesuperconducting (SC) state of an unstrained Sr$_2$RuO$_4$ was reported byPustogow and Luo ${\it et al.}$ They revealed such behavior from thefree-induction decay (FID) signal after a weak RF pulse. We examined thisbehavior with our single-crystalline Sr$_2$RuO$_4$, and reproduced theirresult: the peaks of the $^{17}$O-NMR spectra shift in the SC state as long asthe RF-pulse power is smaller than a threshold. Furthermore, we measured thetemperature variation of the Knight shift by a standard spin-echo method withsmall-power RF pulses, and found that the spin susceptibility decreases in theSC state. We conclude that our previous results of the invariance of the Knightshift in the SC state were due to instantaneous destruction ofsuperconductivity by the RF pulses. The heat-up effect was characterized by thetemperature variation of the Knight shift under various measurement conditions.

Reduction of the $^{17}$O Knight shift in the Superconducting State and the Heat-up Effect by NMR Pulses on Sr$_2$RuO$_4$