Doping dependent isotope effects of the quasi-1D electron-phonon system: comparison with the high-temperature superconductors
| dc.creator | Bindloss, Ian P. | |
| dc.date | 2004-04-16 | |
| dc.date | 2004-12-01 | |
| dc.date.accessioned | 2026-07-07T02:57:40Z | |
| dc.date.available | 2026-07-07T02:57:40Z | |
| dc.description | The weak-coupling quantum phase diagrams of the one-dimensional (1D) Holstein-Hubbard and Peierls-Hubbard models are computed near half-filling, using a multi-step renormalization group technique. If strong enough, the electron-phonon interaction induces a spin gap. The spin gap, which determines the superconducting pairing energy, depends strongly on the band filling and decreases monotonically as the system is doped away from half-filling. However, the superconducting susceptibility exhibits a different doping dependence; it can vary non-monotonically with doping and exhibit a maximum at an "optimal" value of the doping. For a quasi-1D array of weakly coupled, fluctuating 1D chains, the superconducting transition temperature T_c exhibits a similar non-monotonic doping dependence. The effect of changing the ion mass (isotope effect) on T_c is found to be largest near half-filling and to decrease rapidly upon doping away from half-filling. The isotope effect on the spin gap is the opposite sign as the isotope effect on T_c. We discuss qualitative similarities between these results and properties of the high-temperature superconductors. | |
| dc.description | 4 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0404406 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0404406 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/23757 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Doping dependent isotope effects of the quasi-1D electron-phonon system: comparison with the high-temperature superconductors | |
| dc.type | text |