On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3

Stepan Beril; Alexander Starchuk

doi:doi:10.11648/j.ajpa.20231101.12

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On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO₃; SrTiO₃-FeSe-SrTiO₃

Stepan Beril, Alexander Starchuk

Published in American Journal of Physics and Applications (Volume 11, Issue 1)

Received: 12 January 2023 Accepted: 13 February 2023 Published: 15 March 2023

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Abstract

The mechanism of experimentally observed high-temperature superconductivity (HTSC) in thin FeSe films on SrTiO₃-type substrates has been theoretically investigated. Applying the theory of large-radius bipolaronic states developed based on the exact Hamiltonian of electron-phonon interaction for arbitrary multilayer structures, the bipolaronic mechanism of Cooper pairing of polarons in FeSe monolayers on SrTiO₃ substrates is investigated and in three-layer structures SrTiO₃–FeSe–SrTiO₃, which are typical "Ginzburg sandwiches". Approach proposed by Ginzburg to enhance the electron-phonon interaction and achieve HTSС by separating the regions where electrons are located (forming Cooper pairs or bipolarons) with the regions in which excitons are excited (or inertial polarization is induced), made it possible to implement the criteria for the formation of bipolaronic states in multilayer structures with high binding energy, due to the possibility of selecting optimal geometric and material parameters (layer thicknesses, dielectric permittivity, optical frequencies, effective masses). It is shown that the binding energy of bipolarons (E_bp) in these structures is in the range of values for which bipolarons remain stable quasiparticles and can exist at temperatures significantly higher than their Bose condensation temperature. The formation of bipolarons with high binding energy in the FeSe monolayer on the SrTiO₃ substrate provides the emergence of a bipolaronic HTS with a critical temperature (T_c) more than an order of magnitude higher than T_c for massive FeSe crystals. At the same time, the binding energy of the bipolaron in the FeSe layer with thickness d on the SrTiO₃ substrate increases exponentially with decreasing d (E_bp~exp(-d / R_S) R_S is the radius of the polaron) and reaches its maximum value in the limit of the multilayer film FeSe (d→0). The presented theory allows modeling a multilayer system and determining the range of values of the material and geometric parameters of layers forming a multilayer structure with a large number of FeSe layers in which T_c values in the room temperature range can be achieved.

Published in	American Journal of Physics and Applications (Volume 11, Issue 1)
DOI	10.11648/j.ajpa.20231101.12
Page(s)	8-20
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2023. Published by Science Publishing Group

Keywords

Bipolarons, High-Temperature Superconductivity, Electron-Phonon Interaction, Multilayer Structures

References

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Stepan Beril, Alexander Starchuk. (2023). On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. American Journal of Physics and Applications, 11(1), 8-20. https://doi.org/10.11648/j.ajpa.20231101.12

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Stepan Beril; Alexander Starchuk. On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. Am. J. Phys. Appl. 2023, 11(1), 8-20. doi: 10.11648/j.ajpa.20231101.12

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AMA Style

Stepan Beril, Alexander Starchuk. On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. Am J Phys Appl. 2023;11(1):8-20. doi: 10.11648/j.ajpa.20231101.12

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@article{10.11648/j.ajpa.20231101.12,
  author = {Stepan Beril and Alexander Starchuk},
  title = {On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3},
  journal = {American Journal of Physics and Applications},
  volume = {11},
  number = {1},
  pages = {8-20},
  doi = {10.11648/j.ajpa.20231101.12},
  url = {https://doi.org/10.11648/j.ajpa.20231101.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpa.20231101.12},
  abstract = {The mechanism of experimentally observed high-temperature superconductivity (HTSC) in thin FeSe films on SrTiO3-type substrates has been theoretically investigated. Applying the theory of large-radius bipolaronic states developed based on the exact Hamiltonian of electron-phonon interaction for arbitrary multilayer structures, the bipolaronic mechanism of Cooper pairing of polarons in FeSe monolayers on SrTiO3 substrates is investigated and in three-layer structures SrTiO3–FeSe–SrTiO3, which are typical "Ginzburg sandwiches". Approach proposed by Ginzburg to enhance the electron-phonon interaction and achieve HTSС by separating the regions where electrons are located (forming Cooper pairs or bipolarons) with the regions in which excitons are excited (or inertial polarization is induced), made it possible to implement the criteria for the formation of bipolaronic states in multilayer structures with high binding energy, due to the possibility of selecting optimal geometric and material parameters (layer thicknesses, dielectric permittivity, optical frequencies, effective masses). It is shown that the binding energy of bipolarons (Ebp) in these structures is in the range of values for which bipolarons remain stable quasiparticles and can exist at temperatures significantly higher than their Bose condensation temperature. The formation of bipolarons with high binding energy in the FeSe monolayer on the SrTiO3 substrate provides the emergence of a bipolaronic HTS with a critical temperature (Tc) more than an order of magnitude higher than Tc for massive FeSe crystals. At the same time, the binding energy of the bipolaron in the FeSe layer with thickness d on the SrTiO3 substrate increases exponentially with decreasing d (Ebp~exp(-d / RS) RS is the radius of the polaron) and reaches its maximum value in the limit of the multilayer film FeSe (d→0). The presented theory allows modeling a multilayer system and determining the range of values of the material and geometric parameters of layers forming a multilayer structure with a large number of FeSe layers in which Tc values in the room temperature range can be achieved.},
 year = {2023}
}

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TY  - JOUR
T1  - On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3
AU  - Stepan Beril
AU  - Alexander Starchuk
Y1  - 2023/03/15
PY  - 2023
N1  - https://doi.org/10.11648/j.ajpa.20231101.12
DO  - 10.11648/j.ajpa.20231101.12
T2  - American Journal of Physics and Applications
JF  - American Journal of Physics and Applications
JO  - American Journal of Physics and Applications
SP  - 8
EP  - 20
PB  - Science Publishing Group
SN  - 2330-4308
UR  - https://doi.org/10.11648/j.ajpa.20231101.12
AB  - The mechanism of experimentally observed high-temperature superconductivity (HTSC) in thin FeSe films on SrTiO3-type substrates has been theoretically investigated. Applying the theory of large-radius bipolaronic states developed based on the exact Hamiltonian of electron-phonon interaction for arbitrary multilayer structures, the bipolaronic mechanism of Cooper pairing of polarons in FeSe monolayers on SrTiO3 substrates is investigated and in three-layer structures SrTiO3–FeSe–SrTiO3, which are typical "Ginzburg sandwiches". Approach proposed by Ginzburg to enhance the electron-phonon interaction and achieve HTSС by separating the regions where electrons are located (forming Cooper pairs or bipolarons) with the regions in which excitons are excited (or inertial polarization is induced), made it possible to implement the criteria for the formation of bipolaronic states in multilayer structures with high binding energy, due to the possibility of selecting optimal geometric and material parameters (layer thicknesses, dielectric permittivity, optical frequencies, effective masses). It is shown that the binding energy of bipolarons (Ebp) in these structures is in the range of values for which bipolarons remain stable quasiparticles and can exist at temperatures significantly higher than their Bose condensation temperature. The formation of bipolarons with high binding energy in the FeSe monolayer on the SrTiO3 substrate provides the emergence of a bipolaronic HTS with a critical temperature (Tc) more than an order of magnitude higher than Tc for massive FeSe crystals. At the same time, the binding energy of the bipolaron in the FeSe layer with thickness d on the SrTiO3 substrate increases exponentially with decreasing d (Ebp~exp(-d / RS) RS is the radius of the polaron) and reaches its maximum value in the limit of the multilayer film FeSe (d→0). The presented theory allows modeling a multilayer system and determining the range of values of the material and geometric parameters of layers forming a multilayer structure with a large number of FeSe layers in which Tc values in the room temperature range can be achieved.
VL  - 11
IS  - 1
ER  -

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Author Information

Stepan Beril

Department of Theoretical Physics, T. G. Shevchenko Pridnestrovian State University, Tiraspol, Moldova
Alexander Starchuk

Department of Theoretical Physics, T. G. Shevchenko Pridnestrovian State University, Tiraspol, Moldova

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Stepan Beril, Alexander Starchuk. (2023). On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. American Journal of Physics and Applications, 11(1), 8-20. https://doi.org/10.11648/j.ajpa.20231101.12

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Stepan Beril; Alexander Starchuk. On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. Am. J. Phys. Appl. 2023, 11(1), 8-20. doi: 10.11648/j.ajpa.20231101.12

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AMA Style

Stepan Beril, Alexander Starchuk. On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3. Am J Phys Appl. 2023;11(1):8-20. doi: 10.11648/j.ajpa.20231101.12

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@article{10.11648/j.ajpa.20231101.12,
  author = {Stepan Beril and Alexander Starchuk},
  title = {On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3},
  journal = {American Journal of Physics and Applications},
  volume = {11},
  number = {1},
  pages = {8-20},
  doi = {10.11648/j.ajpa.20231101.12},
  url = {https://doi.org/10.11648/j.ajpa.20231101.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpa.20231101.12},
  abstract = {The mechanism of experimentally observed high-temperature superconductivity (HTSC) in thin FeSe films on SrTiO3-type substrates has been theoretically investigated. Applying the theory of large-radius bipolaronic states developed based on the exact Hamiltonian of electron-phonon interaction for arbitrary multilayer structures, the bipolaronic mechanism of Cooper pairing of polarons in FeSe monolayers on SrTiO3 substrates is investigated and in three-layer structures SrTiO3–FeSe–SrTiO3, which are typical "Ginzburg sandwiches". Approach proposed by Ginzburg to enhance the electron-phonon interaction and achieve HTSС by separating the regions where electrons are located (forming Cooper pairs or bipolarons) with the regions in which excitons are excited (or inertial polarization is induced), made it possible to implement the criteria for the formation of bipolaronic states in multilayer structures with high binding energy, due to the possibility of selecting optimal geometric and material parameters (layer thicknesses, dielectric permittivity, optical frequencies, effective masses). It is shown that the binding energy of bipolarons (Ebp) in these structures is in the range of values for which bipolarons remain stable quasiparticles and can exist at temperatures significantly higher than their Bose condensation temperature. The formation of bipolarons with high binding energy in the FeSe monolayer on the SrTiO3 substrate provides the emergence of a bipolaronic HTS with a critical temperature (Tc) more than an order of magnitude higher than Tc for massive FeSe crystals. At the same time, the binding energy of the bipolaron in the FeSe layer with thickness d on the SrTiO3 substrate increases exponentially with decreasing d (Ebp~exp(-d / RS) RS is the radius of the polaron) and reaches its maximum value in the limit of the multilayer film FeSe (d→0). The presented theory allows modeling a multilayer system and determining the range of values of the material and geometric parameters of layers forming a multilayer structure with a large number of FeSe layers in which Tc values in the room temperature range can be achieved.},
 year = {2023}
}

Copy | Download

TY  - JOUR
T1  - On the Bipolaronic Mechanism of High-Temperature Superconductivity in "Ginzburg Sandwiches" FeSe-SrTiO3; SrTiO3-FeSe-SrTiO3
AU  - Stepan Beril
AU  - Alexander Starchuk
Y1  - 2023/03/15
PY  - 2023
N1  - https://doi.org/10.11648/j.ajpa.20231101.12
DO  - 10.11648/j.ajpa.20231101.12
T2  - American Journal of Physics and Applications
JF  - American Journal of Physics and Applications
JO  - American Journal of Physics and Applications
SP  - 8
EP  - 20
PB  - Science Publishing Group
SN  - 2330-4308
UR  - https://doi.org/10.11648/j.ajpa.20231101.12
AB  - The mechanism of experimentally observed high-temperature superconductivity (HTSC) in thin FeSe films on SrTiO3-type substrates has been theoretically investigated. Applying the theory of large-radius bipolaronic states developed based on the exact Hamiltonian of electron-phonon interaction for arbitrary multilayer structures, the bipolaronic mechanism of Cooper pairing of polarons in FeSe monolayers on SrTiO3 substrates is investigated and in three-layer structures SrTiO3–FeSe–SrTiO3, which are typical "Ginzburg sandwiches". Approach proposed by Ginzburg to enhance the electron-phonon interaction and achieve HTSС by separating the regions where electrons are located (forming Cooper pairs or bipolarons) with the regions in which excitons are excited (or inertial polarization is induced), made it possible to implement the criteria for the formation of bipolaronic states in multilayer structures with high binding energy, due to the possibility of selecting optimal geometric and material parameters (layer thicknesses, dielectric permittivity, optical frequencies, effective masses). It is shown that the binding energy of bipolarons (Ebp) in these structures is in the range of values for which bipolarons remain stable quasiparticles and can exist at temperatures significantly higher than their Bose condensation temperature. The formation of bipolarons with high binding energy in the FeSe monolayer on the SrTiO3 substrate provides the emergence of a bipolaronic HTS with a critical temperature (Tc) more than an order of magnitude higher than Tc for massive FeSe crystals. At the same time, the binding energy of the bipolaron in the FeSe layer with thickness d on the SrTiO3 substrate increases exponentially with decreasing d (Ebp~exp(-d / RS) RS is the radius of the polaron) and reaches its maximum value in the limit of the multilayer film FeSe (d→0). The presented theory allows modeling a multilayer system and determining the range of values of the material and geometric parameters of layers forming a multilayer structure with a large number of FeSe layers in which Tc values in the room temperature range can be achieved.
VL  - 11
IS  - 1
ER  -

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