Calculation of the four-spin cyclic exchange in cuprates
Starting from the three-band Hubbard model for the cuprates, we calculate analytically the four-spin cyclic exchange in the limit of infinite on-site Coulomb repulsion and zero O-O hopping tpp using two methods: (i) perturbation theory in tpd/Δ, where tpd is the Cu-O hopping and Δ the Cu-O charge tr...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/97137 |
| Acceso en línea: | http://hdl.handle.net/11336/97137 |
| Access Level: | acceso abierto |
| Palabra clave: | superconducting cuprates cyclic exchange https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | Starting from the three-band Hubbard model for the cuprates, we calculate analytically the four-spin cyclic exchange in the limit of infinite on-site Coulomb repulsion and zero O-O hopping tpp using two methods: (i) perturbation theory in tpd/Δ, where tpd is the Cu-O hopping and Δ the Cu-O charge transfer energy and (ii) exact solution of a Cu4O4 plaquette. The latter method coincides with the first to order eight in tpd and permits us to extend the results to tpd/Δ of order one. The results are relevant to recent experimental and theoretical research that relate the splitting of certain spin excitations with Δ and the superconducting critical temperature. |
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