Volume 63, Number 1, July 2003
|Page(s)||111 - 117|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2003|
Quasiparticle delocalization induced by novel quantum interference in disordered d-wave superconductors
National Laboratory of Solid State Microstructures Nanjing University - Nanjing 210008, PRC
2 Department of Physics, Southeast University - Nanjing 210096, PRC
3 Department of Physics, Tunghai University - Taichung 181, Taiwan
Accepted: 25 April 2003
The diagrammatic approach is applied to study quasiparticle transport properties in two-dimensional d-wave superconductors with dilute, substitutional nonmagnetic impurities both in Born and in unitary limits. It is found that a novel quantum interference process gives rise to a weak-antilocalization correction to the spin conductivity, indicating the existence of extended low-energy quasiparticle states. When coming close to unitarity and nesting, this correction is suppressed and eventually vanishes due to the global particle-hole symmetry.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 73.20.Fz – Weak or Anderson localization / 74.20.-z – Theories and models of superconducting state
© EDP Sciences, 2003
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