Tail states in superconductors with weak magnetic impurities
Abstract
We analyze the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit by using the method of optimal fluctuation. We show that the density of states varies as ln N(E)∝-|E-Δ 0| (7-d)/4 near the mean field gap edge Δ0 in a d-dimensional superconductor. The optimal fluctuation in d>1 is strongly anisotropic. We compare the density of states with that obtained in other recent approaches.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- May 2003
- DOI:
- 10.1016/S0921-4526(02)02372-4
- arXiv:
- arXiv:cond-mat/0210421
- Bibcode:
- 2003PhyB..329.1446V
- Keywords:
-
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 2 pages, to appear in Proceedings of LT-23