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- Title
Film Thickness Dependence of the Critical Temperature of Superconductivity of LSCO Films: A Bipolaron Model Approach.
- Authors
Yavidov, Bakhrom; Khajibaev, Dusmukhammad
- Abstract
The superconductivity of (001) oriented La 1.85 Sr 0.15 CuO 4 cuprate films with different film thicknesses ( d f ) is considered within the bipolaronic mechanism of high- T c superconductivity. It is supposed that high- T c superconductivity of the cuprates is due to Bose–Einstein condensation of an ideal gas of the intersite bipolarons, and therefore, the critical temperature of superconductivity ( T c ) is associated with the Bose–Einstein condensation temperature ( T BEC ) of the intersite bipolarons. Taking the extended Holstein–Hubbard model as a basis for the cuprate films, a relation between T BEC of the ideal gas of the intersite bipolarons of the La 1.85 Sr 0.15 CuO 4 film and the film thickness is established. It is shown that the calculated values of T BEC of the ideal gas of the intersite bipolarons of La 1.85 Sr 0.15 CuO 4 films grown on LaSrAlO 4 and SrTiO 3 substrates correlate (and at certain values of thickness satisfactorily agree) with the experimental values of T c of the above systems. This article is the first theoretical work, according to our knowledge, that shows the fundamental possibility of studying the thickness dependence of the high- T c superconductivity of the cuprate films within the framework of the bipolaronic Bose–Einstein condensation scenario.
- Subjects
CRITICAL temperature; SUPERCONDUCTIVITY; BOSE-Einstein condensation; IDEAL gases; CUPRATES
- Publication
Journal of Low Temperature Physics, 2023, Vol 213, Issue 5/6, p291
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-023-03002-z