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HAIT Journal of Science and Engineering Volume 1, Issue 1, pp. 9-22 © 2004 Holon Academic Institute of Technology | ||||||
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Low energy excitation spectrum in a layered superconductor vortex with small number of impurities in the vortex core
Anatoly I. Larkin1,2 and Yuri N. Ovchinnikov2,*
1Theoretical Physical Institute, University of Minnesota, | 116 Church Street SE, Minneapolis, MN 55455, USA 2L.D. Landau Institute for Theoretical Physics, 2 Kosygin Street, Moscow 117334, Russia *Corresponding author: ovc@itp.ac.ru Received 19 October 2003
| The low energy exitation spectrum is found for a layered superconductor with small number of impurities inside the vortex core. All levels are found to be correlated. The level shift increases as the impurity comes closer to the vortex center. At some distance from the impurity to the vortex center levels practically cross. It is very important that all levels with small energy cross simultaneously. In such a case a statistical description of level position is impossible. If we neglect the weak repulsion of levels in this region, the positions of levels as a function of the distance from the vortex core to the impurity form two families of crossing straight lines. This leads to a strong enhancement of the conductivity in superclean layered superconductors.
___________________ | Presented at Russian-Israeli Conference Frontiers in Condensed Matter Physics Shoresh, Israel, 19-24 October 2003 |