Nanoscale inhomogeneity and the evolution of correlation strength in FeSe[Formula: see text]S[Formula: see text]

Yu Liu; Aifeng Wang; Qianheng Du; Lijun Wu; Yimei Zhu; Cedomir Petrovic

doi:10.1186/s40580-023-00405-2

Nanoscale inhomogeneity and the evolution of correlation strength in FeSe[Formula: see text]S[Formula: see text]

Nano Converg. 2023 Dec 22;10(1):59. doi: 10.1186/s40580-023-00405-2.

Authors

Yu Liu^{1

2}, Aifeng Wang^{1

3}, Qianheng Du^{1

4

5}, Lijun Wu¹, Yimei Zhu¹, Cedomir Petrovic^{1

4}

Affiliations

¹ Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA.
² Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou, 310058 China.
³ Present Address: College of Physics, Chongqing University, Chongqing, 401331 China.
⁴ Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NeY 11790 USA.
⁵ Present Address: Material Science Division, Argonne National Laboratory, Lemont, IL 60439 USA.

Abstract

We report a comprehensive study of the nanoscale inhomogeneity and disorder on the thermoelectric properties of FeSe[Formula: see text]S[Formula: see text] ([Formula: see text]) 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 FeSe[Formula: see text]S[Formula: see text].

Keywords: Disorder; Electronic correlation; Superconductivity; Thermoelectricity.

Grants and funding

DE-SC0012704/Basic Energy Sciences