Effect of inhomogeneous coupling on superconductivity
| dc.creator | Zou, Yue | |
| dc.creator | Klich, Israel | |
| dc.creator | Refael, Gil | |
| dc.date | 2007-12-11 | |
| dc.date.accessioned | 2026-07-07T09:37:40Z | |
| dc.date.available | 2026-07-07T09:37:40Z | |
| dc.description | We investigate the influence of inhomogeneity in the pairing coupling constant $U(\vec r)$ on dirty BCS superconductors, focusing on $T_c$, the order parameter $Δ(\vec r)$, and the energy gap $E_g(\vec r)$. Within mean-field theory, we find that when the length-scale of the inhomogeneity is comparable to, or larger than the coherence length, the ratio $2E_g/T_c$ is significantly reduced from that of a homogeneous superconductor, while in the opposite limit this ratio stays unmodified. In two dimensions, when strong phase fluctuations are included, the Kosterlitz-Thouless temperature $T_{KT}$ is also studied. We find that when the inhomogeneity length scale is much larger than the coherence length, $2E_g/T_{KT}$ can be larger than the usual BCS value. We use our results to qualitatively explain recent experimental observation of a surprisingly low value of $2E_g/T_c$ in thin films. | |
| dc.description | 12 pages, 14 figures | |
| dc.identifier | https://arxiv.org/abs/0712.1761 | |
| dc.identifier | http://arxiv.org/abs/0712.1761 | |
| dc.identifier | Phys. Rev. B 77, 144523 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.144523 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/160539 | |
| dc.subject | Superconductivity | |
| dc.title | Effect of inhomogeneous coupling on superconductivity | |
| dc.type | text |