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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

d-Wave pairing driven by bipolaric modes related to giant electron-phonon anomalies in high-T-c superconductors

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Autor(es):
Bru, Jean-Bernard [1, 2, 3] ; de Pasquale, Antonio Delgado [4] ; Pedra, Walter de Siqueira [4]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] BCAM, Bilbao 48009 - Spain
[2] Basque Fdn Sci, Ikerbasque, Bilbao 48011 - Spain
[3] Univ Basque Country, Fac Ciencia & Tecnol, Dept Matemat, E-48080 Bilbao - Spain
[4] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, BR-05314970 Sao Paulo, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT; MAR 2015.
Citações Web of Science: 1
Resumo

Taking into account microscopic properties of most usual high-T-c superconductors, like cuprates, we define a class of microscopic model Hamiltonians for two fermions (electrons or holes) and one boson (bipolaron) on the two-dimensional square lattice. We establish that these model Hamiltonians can show d-wave pairing at the bottom of their spectrum, despite their space isotropy. This phenomenon appears when a `giant electron-phonon anomaly' is present at the boundaries of the Brillouin zone ('half breathing' bond-stretching mode), as in doped cuprates. Our results can be used to derive effective electron-electron interactions mediated by bipolarons and we discuss regimes where the corresponding model is relevant for the physics of high-temperature superconductivity and can be mathematically rigorously studied. (AU)

Processo FAPESP: 13/13215-5 - Produção de calor em sistemas fermiônicos infinitos sujeitos a campos elétricos
Beneficiário:Walter Alberto de Siqueira Pedra
Linha de fomento: Auxílio à Pesquisa - Regular