Effect of magnetic field on impurity bound states in high-temperature superconductors

Details Effect of magnetic field on impurity bound states in high-temperature superconductors Effect of magnetic field on impurity bound states in high-temperature superconductors

2001-07-04

arxiv.org/abs/cond-mat/0107091v1

Phys. Rev. B 64, 024507 (2001)

Physics

Condensed Matter

Superconductivity

RevTeX, 5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.64.024507

We consider the influence of a magnetic field H on the quasiparticle bound states near scalar impurities in d-wave superconductors. A ``Doppler shift'' in the excitation energies induced by the supercurrent leads to several important effects. At large but finite impurity strength, there are corrections to the energy and width of the impurity-induced resonance, proportional to H^2. On the other hand, in the limit of very strong impurity potential (unitary limit), the bound state is destroyed and acquires a finite width proportional to H/ln H. There are also considerable changes in the asymptotic behaviour of the bound state wave functions.

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