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

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

2000-07-27

arxiv.org/abs/cond-mat/0007431v5

Phys. Rev. Lett. 86, 296 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 color figures. Found improved saddle-point with d-wave correlations near the impurity; onset of Kondo screening now

Scientific paper

10.1103/PhysRevLett.86.296

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.

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