Superconductivity Driven by the Interband Coulomb Interaction and Implications for the Superconducting Mechanism of MgB2
| dc.creator | Imada, Masatoshi | |
| dc.date | 2001-03-01 | |
| dc.date.accessioned | 2026-07-25T21:48:51Z | |
| dc.description | Superconducting mechanism mediated by interband exchange Coulomb repulsion is examined in an extended two-band Hubbard models with a wide band crossing the Fermi level and coexisting with a narrower band located at moderately lower energy. We apply newly developed path-integral renormalization group method to reliably calculate pairing correlations. The correlation shows marked enhancement at moderate amplitudes of the exchange Coulomb repulsion taken smaller than the on-site repulsion for the narrower band. The pairing symmetry is s-wave while it has unconventional phases with the opposite sign between the order parameters on the two bands, in agreement with the mean-field prediction. Since the band structure of recently discovered superconductor MgB$_2$ shares basic similarities with our model, we propose that the present results provide a relevant clue for the understanding of the superconducting mechanism in MgB$_2$ as well as in this class of multi-band materials with good metallic conduction in the normal state. | |
| dc.description | 4pages, 2figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0103006 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0103006 | |
| dc.identifier | J. Phys. Soc. Jpn. 70 (2001) 1218 | |
| dc.identifier | doi:10.1143/JPSJ.70.1218 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/83117 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Superconductivity Driven by the Interband Coulomb Interaction and Implications for the Superconducting Mechanism of MgB2 | |
| dc.type | text |