Magnetic effect from non-magnetic impurity in superconducting plane
Bogolyubov Institute for Theoretical Physics
14b Metrologichna str., 03143 Kiev-143, Ukraine
2 CFP/Departamento de Fisica, Unversidade do Porto Rua do Campo Alegre 687, 4169-007 Porto, Portugal
Accepted: 26 September 2002
We propose a new model of impurity center formed by a cathion substitute for , like , in planes. Its main effect on superconducting electrons is due to the non-zero exchange field on sites, neighbors to (non-magnetic) impurity. We discuss a strong suppression of the d-wave order parameter, a zero-energy resonance in the local density of states, and spin polarization of charge carriers, which can be related to the experimentally observed effects in -doped copper oxides. These results are obtained without using the widely accepted unitary scattering limit.
PACS: 74.20.-z – Theories and models of superconducting state / 74.62.Dh – Effects of crystal defects, doping and substitution / 74.72.-h – High- compounds
© EDP Sciences, 2002