Reduction of the 17O Knight Shift in the Superconducting State and the Heat-up Effect by NMR Pulses on Sr2RuO4
Top Cited Papers
Open Access
- 15 March 2020
- journal article
- research article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 89 (3)
- https://doi.org/10.7566/JPSJ.89.034712
Abstract
Quite recently, a pronounced drop of O-17 NMR Knight shift in the superconducting (SC) state of an unstrained Sr2RuO4 was reported by Pustogow and Luo et al. They revealed such behavior from the free-induction decay (FID) signal after a weak RF pulse. We examined this behavior with our single-crystalline Sr2RuO4, and reproduced their result: the peaks of the O-17-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 the 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.Other Versions
This publication has 38 references indexed in Scilit:
- Competing ground states in triple-layeredVerging on itinerant ferromagnetism with critical fluctuationsPhysical Review B, 2003
- Spin-triplet superconductivity in Sr2RuO4 identified by 17O Knight shiftNature, 1998
- Extremely Strong Dependence of Superconductivity on Disorder inPhysical Review Letters, 1998
- Anisotropic pairing in superconductingRu NMR and NQR studiesPhysical Review B, 1997
- Superconductivity in a layered perovskite without copperNature, 1994
- Knight shifts in the superconducting state of(=90 K)Physical Review B, 1990
- NMR study of local spin susceptibility in alignedpowderPhysical Review Letters, 1989
- Spin susceptibility in superconductingfromKnight shiftPhysical Review B, 1989
- Nuclear Relaxation and Knight Shift Studies of Copper in YBa2Cu3O7-yJournal of the Physics Society Japan, 1988
- A study of the magnetic superexchange interactions in the solid-solution series CaxSr1−xRuO3 by ruthenium-99 Mo¨ssbauer spectroscopyJournal of Solid State Chemistry, 1974