Fig. 3: 77Se Knight shift (K) of FeSe1−xSx determined from nuclear magnetic resonance (NMR) spectra.
From: Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
a Temperature dependence of K at high temperatures. The shifts were measured at the field (6.0 T) parallel to the FeSe plane. In the nematic phase (x < 0.17), two peaks or edges appear as shown in Fig. 3c. We plotted the average of two peaks for K below Tnem. The data for 12%-S-substituted sample (x = 0.12) was cited from the previous works20,23. b K below Tnem for x = 0.05 and 0.12. Tnem and Tc represent the nematic and superconducting transition temperatures, respectively. Two peaks in Fig. 3c and their average are shown in both panels. Both panels are expansions of Fig. 3a. c 77Se-NMR spectra for x = 0.05, 0.12, and 0.18. Two peaks appearing for x = 0.05 and 0.12 merge into a single peak with increasing S-substitution level over xc (≥0.17).
