Theory of isotope exponent for high critical temperature superconductors

We calculate the isotopic exponent α for a Hubbard Hamiltonian with the presence of local Coulomb interaction U and an attractive BCS type potential V by using a normal state one-particle Green function, G N ( k → , iω n) , which is renormalized by the interactions. The BCS type pairing interaction...

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Published inPhysica. C, Superconductivity Vol. 364; pp. 144 - 146
Main Authors de Mello, E.V.L., Rodrı́guez-Núñez, J.J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2001
Subjects
Coulomb interaction
Cuprates
Hubbard Hamiltonian
Isotope exponent
Isotope exponent
Coulomb interaction
Hubbard Hamiltonian
Cuprates
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Summary:We calculate the isotopic exponent α for a Hubbard Hamiltonian with the presence of local Coulomb interaction U and an attractive BCS type potential V by using a normal state one-particle Green function, G N ( k → , iω n) , which is renormalized by the interactions. The BCS type pairing interaction V acts within a region ℏ ω D around the Fermi energy and it is appropriate to study α as function of the hole density ρ. Our results for α vs ρ for relevant U and V values for some high temperature superconductors reproduce the general main features and are in very good agreement with the experimental data.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(01)00734-1