| Автор | A Theumann |
| Автор | M A P Idiart |
| Дата выпуска | 1991-05-27 |
| dc.description | The authors revisit the theory of the upper critical field of disordered superconductors and present an alternative calculation of B<sub>c2</sub> where they avoid semiclassical arguments and work from the start with Landau levels. As in other current theories they neglect Coulomb interactions and concentrate on localization effects. by generalizing the self-consistent theory by Vollhardt and Wolfle (1980) to a system lacking translational and time reversal invariance. They analyse the theory in configuration space and discuss the approximations that lead to closed self-consistent equations that would reproduce well known results in the non-magnetic case. In the low-field limit they obtain a pair of coupled equations for the frequency-renormalized diffusion coefficient and conductivity. As a result of detailed calculation from first principles they detect a suppression of the diffusion pole in one of the equations that was overlooked in a phenomenological theory. The results for the upper critical field exhibit a change from negative to positive curvature in the B<sub>c2 </sub>versus T plot for increasing disorder and they are compared with those obtained in the theory of Kotliar and Kapitulnik (1986). |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Self-consistent localization theory in magnetic fields and the upper critical field of disordered superconductors |
| Тип | paper |
| DOI | 10.1088/0953-8984/3/21/009 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 3 |
| Первая страница | 3765 |
| Последняя страница | 3775 |
| Аффилиация | A Theumann; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil |
| Аффилиация | M A P Idiart; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil |
| Выпуск | 21 |
