Impurity-induced virtual bound states in {ital d}-wave superconductors
Journal Article
·
· Physical Review, B: Condensed Matter
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
It is shown that a single, strongly scattering impurity produces a bound or a virtual-bound quasiparticle state inside the gap in a {ital 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 {ital 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.
- OSTI ID:
- 54956
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 51, Issue 21; Other Information: PBD: 1 Jun 1995
- Country of Publication:
- United States
- Language:
- English
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