Impurity in a d-wave superconductor: Kondo effect and STM spectra

Abstract

We present a theory for recent STM studies of Zn impurities in the superconductor BSCCO, using insights from NMR experiments which show that there is a net S=1/2 moment on the Cu ions near the Zn. We argue that the Kondo spin dynamics of this moment is the origin of the low bias peak in the differential conductance, rather than a resonance in a purely potential scattering model. The spatial and energy dependence of the STM spectra of our model can also fit the experiments.

arXiv comment4 pages, 2 color figures. Found improved saddle-point with d-wave correlations near the impurity; onset of Kondo screening now occurs at a significantly smaller coupling, but there is little qualitative change in other features. Noted connection to STM of Kondo impurities in normal metals. Final version as published

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