Impurity-induced virtual bound states in d-wave superconductors
A. V. Balatsky, M. I. Salkola, A. Rosengren
DOI 10.1103/PhysRevB.51.15547 · Physical Review B
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Abstract
It is shown that a single, strongly scattering impurity produces a bound or a virtual-bound quasiparticle state inside the gap in a d-wave superconductor. The explicit form of the bound-state wave function is found to decay exponentially with angle-dependent range. These states provide a natural explanation of the second Cu NMR rate arising from the sites close to Zn impurities in the cuprates. Finally, for finite density of impurities in a d-wave superconductor, we re-examine the growth of these states into an impurity band, and discuss the Mott criterion for the metal-insulator transition in this band.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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