Magnetic field-induced gapless state in multiband superconductors
| dc.creator | Barzykin, Victor | |
| dc.date | 2008-07-09 | |
| dc.date.accessioned | 2026-07-07T13:06:09Z | |
| dc.date.available | 2026-07-07T13:06:09Z | |
| dc.description | We investigate theoretically the properties of s-wave multiband superconductors in the weak coupling (BCS) limit in the presence of pair-breaking effects of magnetic field. It is shown that a qualitatively new gapless superconducting state must appear in quasi-2D superconductors in magnetic fields parallel to the plane, corresponding to a Sarma state induced on one of the Fermi surfaces. The emergence of the new state in s-wave multiband superconductors in the absence of anisotropy or spin-orbit interaction is usually accompanied by a zero-temperature first-order metamagnetic phase transition. For anisotropic or non s-wave multiband superconductors the order of the zero-temperature metamagnetic transition depends on model parameters, and it may take the form of a smooth crossover. The details of the temperature-magnetic field phase diagram for multiband superconductors are investigated analytically at zero temperature and numerically at a finite temperature. It is shown the zero-temperatures first-order phase transition gives rise to a critical region on the B-T phase diagram. We suggest possible experiments to detect the new gapless state. | |
| dc.description | 16 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/0807.1466 | |
| dc.identifier | http://arxiv.org/abs/0807.1466 | |
| dc.identifier | Phys. Rev. B 79, 134517 (2009) | |
| dc.identifier | doi:10.1103/PhysRevB.79.134517 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/227690 | |
| dc.subject | Superconductivity | |
| dc.title | Magnetic field-induced gapless state in multiband superconductors | |
| dc.type | text |