Impurity in a d-Wave Superconductor: Kondo Effect and STM Spectra

Anatoli Polkovnikov; Subir Sachdev; Matthias Vojta

doi:10.1103/PhysRevLett.86.296

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Impurity in a d-Wave Superconductor: Kondo Effect and STM Spectra

Anatoli Polkovnikov, Subir Sachdev, Matthias Vojta

DOI 10.1103/PhysRevLett.86.296 · Physical Review Letters

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown