Nanoscale inhomogeneity and the evolution of correlation strength in FeSe S
Yu Liu1,2, Aifeng Wang1,3, Qianheng Du1,4,5
1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA.
Abstract:
We report a comprehensive study of the nanoscale inhomogeneity and disorder on the thermoelectric properties of FeSeS() single crystals and the evolution of correlation strength with S substitution. A hump-like feature in temperature-dependent thermpower is enhanced for x = 0.12 and 0.14 in the nematic region with increasing in orbital-selective electronic correlations, which is strongly suppressed across the nematic critical point and for higher S content. Nanoscale Se/S atom disorder in the tetrahedral surroundings of Fe atoms is confirmed by scanning transmission electron microscopy measurements, providing an insight into the nanostructural details and the evolution of correlation strength in FeSeS.
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