Impurity in a d-wave superconductor: Kondo effect and STM spectra
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Citation (published version)A Polkovnikov, S Sachdev, M Vojta. 2001. "Impurity in a d-wave superconductor: Kondo effect and STM spectra." PHYSICAL REVIEW LETTERS, Volume 86, Issue 2, pp. 296 - 299 (4). https://doi.org/10.1103/PhysRevLett.86.296
We present a theory for recent STM studies of Zn impurities in the superconductor Bi₂Sr₂CaCu₂O₈+𝛿, 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.