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

Abstract

Quite recently, a pronounced drop of ${}^{17}$O NMR Knight shift in the superconducting (SC) state of an unstrained Sr${}_2$RuO${}_4$ was reported by Pustogow and Luo $etal.$ They revealed such behavior from the free-induction decay (FID) signal after a weak RF pulse. We examined this behavior with our single-crystalline Sr${}_2$RuO${}_4$, and reproduced their result: the peaks of the ${}^{17}$O-NMR spectra shift in the SC state as long as the RF-pulse power is smaller than a threshold. Furthermore, we measured the temperature variation of the Knight shift by a standard spin-echo method with small-power RF pulses, and found that the spin susceptibility decreases in the SC state. We conclude that our previous results of the invariance of the Knight shift in the SC state were due to instantaneous destruction of superconductivity by the RF pulses. The heat-up effect was characterized by the temperature variation of the Knight shift under various measurement conditions.

18 pages, 7 figures

References in corpus (7)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Pronounced drop of ${}^{17}$O NMR Knight shift in superconducting state of Sr${}_2$RuO${}_4$
• First-Order Superconducting Transition of Sr2RuO4
• Spin fluctuations in Sr2RuO4 from polarized neutron scattering: implications for superconductivity
• Sharp magnetization jump at the first-order superconducting transition in Sr2RuO4
• Specific-heat evidence of the first-order superconducting transition in Sr2RuO4
• Absence of ${}^{17}$O Knight-Shift Changes across the First-Order Phase Transition Line in Sr${}_2$RuO${}_4$

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