Local Quasiparticle States around an Anderson Impurity in a d-Wave Superconductor: Kondo Effects

Details Local Quasiparticle States around an Anderson Impurity in a d-Wave Superconductor: Kondo Effects Local Quasiparticle States around an Anderson Impurity in a d-Wave Superconductor: Kondo Effects

2000-08-09

arxiv.org/abs/cond-mat/0008156v3

Physics

Condensed Matter

Superconductivity

To appear in Physical Review B as a Rapid Communication (January 1, 2001)

Scientific paper

10.1103/PhysRevB.63.020506

The Kondo effects of an Anderson impurity embedded into a d-wave superconductor is studied. Within the slave-boson mean-field approach, the derived Bogoliubov-de Gennes equations are solved via exact diagonalization. We show that a critical coupling strength, above which the Kondo effect takes place, exists regardless of whether the band particle-hole symmetry is present or not. The resonant quasiparticle peaks are found in the local density of states (LDOS) both directly at the impurity and around its neighbors, which is in sharp contrast to the case of nonmagnetic unitary impurities, where the LDOS vanishes on the impurity site.

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