A two band model for superconductivity: probing interband pair formation
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0103-97332003000400015 http://hdl.handle.net/11449/25043 |
Resumo: | We propose a two band model for superconductivity. It turns out that the simplest nontrivial case considers solely interband scattering, and both bands can be modeled as symmetric (around the Fermi level) and flat, thus each band is completely characterized by its half-band width Wn (n=1,2). A useful dimensionless parameter is d, proportional to W2 - W1. The case delta = 0 retrieves the conventional BCS model. We probe the specific heat, the ratio gap over critical temperature, the thermodynamic critical field and tunneling conductance as functions of d and temperature (from zero to Tc). We compare our results with experimental results for MgB2 and good quantitative agreement is obtained, indicating the relevance of interband coupling. Work in progress also considers the inclusion of band hybridization and general interband as well as intra-band scattering mechanisms. |
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Repositório Institucional da UNESP |
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A two band model for superconductivity: probing interband pair formationWe propose a two band model for superconductivity. It turns out that the simplest nontrivial case considers solely interband scattering, and both bands can be modeled as symmetric (around the Fermi level) and flat, thus each band is completely characterized by its half-band width Wn (n=1,2). A useful dimensionless parameter is d, proportional to W2 - W1. The case delta = 0 retrieves the conventional BCS model. We probe the specific heat, the ratio gap over critical temperature, the thermodynamic critical field and tunneling conductance as functions of d and temperature (from zero to Tc). We compare our results with experimental results for MgB2 and good quantitative agreement is obtained, indicating the relevance of interband coupling. Work in progress also considers the inclusion of band hybridization and general interband as well as intra-band scattering mechanisms.Universidade Estadual Paulista IGCE Departamento de FísicaUniversidade Estadual de Campinas Instituto de Física 'Gleb Wataghin'Universidade Estadual Paulista IGCE Departamento de FísicaSociedade Brasileira de FísicaUniversidade Estadual Paulista (Unesp)Universidade Estadual de Campinas (UNICAMP)Lagos, R. E. [UNESP]Cabrera, G. G.2013-09-30T18:51:07Z2014-05-20T14:16:48Z2013-09-30T18:51:07Z2014-05-20T14:16:48Z2003-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article713-717application/pdfhttp://dx.doi.org/10.1590/S0103-97332003000400015Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 33, n. 4, p. 713-717, 2003.0103-9733http://hdl.handle.net/11449/2504310.1590/S0103-97332003000400015S0103-97332003000400015S0103-97332003000400015.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Physics1.0820,276info:eu-repo/semantics/openAccess2023-12-11T06:16:36Zoai:repositorio.unesp.br:11449/25043Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:02:40.077919Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
A two band model for superconductivity: probing interband pair formation |
title |
A two band model for superconductivity: probing interband pair formation |
spellingShingle |
A two band model for superconductivity: probing interband pair formation Lagos, R. E. [UNESP] |
title_short |
A two band model for superconductivity: probing interband pair formation |
title_full |
A two band model for superconductivity: probing interband pair formation |
title_fullStr |
A two band model for superconductivity: probing interband pair formation |
title_full_unstemmed |
A two band model for superconductivity: probing interband pair formation |
title_sort |
A two band model for superconductivity: probing interband pair formation |
author |
Lagos, R. E. [UNESP] |
author_facet |
Lagos, R. E. [UNESP] Cabrera, G. G. |
author_role |
author |
author2 |
Cabrera, G. G. |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Estadual de Campinas (UNICAMP) |
dc.contributor.author.fl_str_mv |
Lagos, R. E. [UNESP] Cabrera, G. G. |
description |
We propose a two band model for superconductivity. It turns out that the simplest nontrivial case considers solely interband scattering, and both bands can be modeled as symmetric (around the Fermi level) and flat, thus each band is completely characterized by its half-band width Wn (n=1,2). A useful dimensionless parameter is d, proportional to W2 - W1. The case delta = 0 retrieves the conventional BCS model. We probe the specific heat, the ratio gap over critical temperature, the thermodynamic critical field and tunneling conductance as functions of d and temperature (from zero to Tc). We compare our results with experimental results for MgB2 and good quantitative agreement is obtained, indicating the relevance of interband coupling. Work in progress also considers the inclusion of band hybridization and general interband as well as intra-band scattering mechanisms. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-01 2013-09-30T18:51:07Z 2013-09-30T18:51:07Z 2014-05-20T14:16:48Z 2014-05-20T14:16:48Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S0103-97332003000400015 Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 33, n. 4, p. 713-717, 2003. 0103-9733 http://hdl.handle.net/11449/25043 10.1590/S0103-97332003000400015 S0103-97332003000400015 S0103-97332003000400015.pdf |
url |
http://dx.doi.org/10.1590/S0103-97332003000400015 http://hdl.handle.net/11449/25043 |
identifier_str_mv |
Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 33, n. 4, p. 713-717, 2003. 0103-9733 10.1590/S0103-97332003000400015 S0103-97332003000400015 S0103-97332003000400015.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Physics 1.082 0,276 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
713-717 application/pdf |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129154530410496 |