Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model
The two-orbital Hubbard model is used to obtain formulas for the fermion excitation spectrum in the energy bands hybridized by Anderson's interaction. A transition to the Hubbard operators, which diagonalizes the one-site part of the Hamiltonian, allows us to use the Green's temperature fu...
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| Published in: | Физика низких температур |
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| Date: | 1998 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1998
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/174987 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model / A.A. Kosov // Физика низких температур. — 1998. — Т. 24, № 3. — С. 204-214. — Бібліогр.: 22 назв. — англ. |
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Kosov, A.A. 2021-01-29T11:28:04Z 2021-01-29T11:28:04Z 1998 Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model / A.A. Kosov // Физика низких температур. — 1998. — Т. 24, № 3. — С. 204-214. — Бібліогр.: 22 назв. — англ. 0132-6414 PACS: 74.20.-z https://nasplib.isofts.kiev.ua/handle/123456789/174987 The two-orbital Hubbard model is used to obtain formulas for the fermion excitation spectrum in the energy bands hybridized by Anderson's interaction. A transition to the Hubbard operators, which diagonalizes the one-site part of the Hamiltonian, allows us to use the Green's temperature function technique to take into account the interstitial jump term while studying the superconducting properties of the model. An analysis of the lower part of the energy spectrum leads to a formula for the superconducting transition temperature Tc associated with the pairing of quasiparticles in one of the correlated bands. The dependence of Tc on electron concentration and energy parameters determining the intraatomic correlation is studied. Proposing a simple relation between the value of pressure (P) and width of the correlated band, the dependence of Tc on the pressure was defined. Good agreement between the theoretical calculation of the dependence of Tc on the pressure and the experimental results for Y1-xPrxBa₂Cu₃O₇-δ is found. Comparison of the theoretical and experimental results for the dependence of Tc and its derivative d(lnTc)/dP on Sr and Bi-content (x) in La₂-xSrxCuO₄ has been made. It is concluded that the model under consideration can be used for the description of the shift in Tc under pressure for a number of superconductors. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model |
| spellingShingle |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model Kosov, A.A. Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| title_short |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model |
| title_full |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model |
| title_fullStr |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model |
| title_full_unstemmed |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model |
| title_sort |
analysis of the shift in the superconducting transition under pressure in the anderson-hubbard two-orbital model |
| author |
Kosov, A.A. |
| author_facet |
Kosov, A.A. |
| topic |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| publishDate |
1998 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
The two-orbital Hubbard model is used to obtain formulas for the fermion excitation spectrum in the energy bands hybridized by Anderson's interaction. A transition to the Hubbard operators, which diagonalizes the one-site part of the Hamiltonian, allows us to use the Green's temperature function technique to take into account the interstitial jump term while studying the superconducting properties of the model. An analysis of the lower part of the energy spectrum leads to a formula for the superconducting transition temperature Tc associated with the pairing of quasiparticles in one of the correlated bands. The dependence of Tc on electron concentration and energy parameters determining the intraatomic correlation is studied. Proposing a simple relation between the value of pressure (P) and width of the correlated band, the dependence of Tc on the pressure was defined. Good agreement between the theoretical calculation of the dependence of Tc on the pressure and the experimental results for Y1-xPrxBa₂Cu₃O₇-δ is found. Comparison of the theoretical and experimental results for the dependence of Tc and its derivative d(lnTc)/dP on Sr and Bi-content (x) in La₂-xSrxCuO₄ has been made. It is concluded that the model under consideration can be used for the description of the shift in Tc under pressure for a number of superconductors.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/174987 |
| citation_txt |
Analysis of the shift in the superconducting transition under pressure in the Anderson-Hubbard two-orbital model / A.A. Kosov // Физика низких температур. — 1998. — Т. 24, № 3. — С. 204-214. — Бібліогр.: 22 назв. — англ. |
| work_keys_str_mv |
AT kosovaa analysisoftheshiftinthesuperconductingtransitionunderpressureintheandersonhubbardtwoorbitalmodel |
| first_indexed |
2025-12-07T15:17:02Z |
| last_indexed |
2025-12-07T15:17:02Z |
| _version_ |
1850863122294767616 |