Impurity resonant state in d-wave superconductors: in favor of a Kondo-like response

Abstract

We investigate the impurity resonant state induced by non-magnetic impurities in d-wave cuprate superconductors in two different impurity models: (i) in a pure potential scattering model within the T-matrix approach and (ii) in a Bose-Fermi Kondo model within the large-N formalism. We modify the superconducting host to resemble the nanoscale electronic inhomogeneities seen in the scanning tunneling microscopy (STM) spectra (i.e., the small- and large-gap domains) and study how this influences the impurity resonance. In the pure potential scattering model the resonant state is found to be a rather robust feature appearing in all host domains. On the other hand, in the Kondo-like model the impurity resonance can appear in the small-gap regions of the host and be completely suppressed in the large-gap regions; this is in agreement with the STM experimental data for Zn-doped BSCCO. Our results imply that the Kondo spin dynamics of the impurity moment is the origin of the impurity resonant state in d-wave superconductors, rather than the pure potential scattering.

arXiv comment11 pages, 7 figs

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Cited by in corpus (4)

• Disappearance of zinc impurity resonance in large gap region on Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ probed by scanning tunneling spectroscopy
• Extinction of impurity resonances in large-gap regions of inhomogeneous d-wave superconductors
• Impurity Quantum Phase Transition in a Current-Carrying d-Wave Superconductor
• Kondo Compensation in a Pseudogap Phase: a Renormalization Group Study