Thickness dependence of superconductivity in FeSe films
Institute of Theoretical Physics, University of Science and Technology Beijing, 100083, Beijing, China
2 Department of Physics, University of Central Florida, FL32816, Orlando,, USA
Accepted: 21 May 2023
Published online: 7 June 2023
Thin films of FeSe on substrates have attracted attention because of their unusually high-temperature (Tc) superconducting properties whose origins continue to be debated. To disentangle the competing effects of the substrate and interlayer and intralayer processes, we present here results of density functional theory-based analysis of the electronic structure of unsupported FeSe films consisting of 1–5 layers (1L–5L). Furthermore, by solving the Bardeen-Schrieffer-Cooper equation with spin-wave exchange attraction derived from the Hubbard model, we find the superconducting critical temperature Tc for 1L-5L and bulk FeSe systems in reasonable agreement with experimental data. Our results point to the importance of correlation effects in superconducting properties of single- and multi-layer FeSe films, independently of the role of substrate.
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