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

Authors
Polkovnikov, A Sachdev, S Vojta, M
Citation
A. Polkovnikov et al., Impurity in a d-wave superconductor: Kondo effect and STM spectra, PHYS REV L, 86(2), 2001, pp. 296-299
Citations number
43
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
2
Year of publication
2001
Pages
296 - 299
Database
ISI
SICI code
0031-9007(20010108)86:2<296:IIADSK>2.0.ZU;2-D
Abstract
We present a theory for recent STM: studies of Zn impurities in the superco nductor Bi2Sr2CaCu2O8+delta, 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 th at the Kondo spin dynamics of this moment is the origin of the low bias pea k in the differential conductance, rather than a resonance in a purely pote ntial scattering model. The spatial and energy dependence of the STM spectr a of our model can also fit the experiments.