Weak coupling model for s*- and d-wave superconductivity
| dc.creator | van der Marel, D. | |
| dc.date | 1993-09-02 | |
| dc.date | 1993-09-15 | |
| dc.date.accessioned | 2026-07-07T08:58:46Z | |
| dc.date.available | 2026-07-07T08:58:46Z | |
| dc.description | The phase diagram of the unconstrained $t-J$ model is calculated using the random phase approximation. It is found that the extended $s$ and the $d_{x^2-y^2}$-channels are {\em not} degenerate near half filling. Extended $s$-pairing with a low $T_c$ occurs only for a band containing less then 0.4 electrons or holes per unit cell, whereas in a large region around half-filling $d$-wave pairing is the only stable superconducting solution. At half filling superconductivity is suppressed due to the formation of the anti-ferromagnetic Mott-Hubbard insulating state. By extending the analysis to the unconstrained $t-t'-J$ model, it is proven that, if a Fermi surface is assumed similar to the one that is known to exist in cuprous oxide superconductors, the highest superconducting $T_c$ is reached for about $0.7$ electron per site, whereas the anti-ferromagnetic solution still occurs for $1$ electron per site. It is shown, that the maximum $d$-wave superconducting mean field transition temperature is half the maximum value that the Neèl temperature can have in the Mott-insulating state. | |
| dc.description | 20 pages, (Critical remarks removed), revtex, th-92-08-01 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9309003 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9309003 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/147457 | |
| dc.subject | Condensed Matter | |
| dc.title | Weak coupling model for s*- and d-wave superconductivity | |
| dc.type | text |