Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1039-1052    ( к оглавлению , назад )

Formation of d-wave superconducting order in a randomly doped lattice

V. M. Loktev and Yu. G. Pogorelov

Bogolyubov Institute for Theoretical Physics of the National Academy of Science of Ukraine 14b, Metrologichna Str., Kiev, 03143, Ukraine
E-mail: vloktev@bitp.kiev.ua

Received May 14, 2001

Аннотация

We consider the interplay between superconducting coupling and dopant impurity scattering of charge carriers in planar square lattice systems and examine the physical conditions (doping level, temperature, local symmetry of coupling and scattering potentials) necessary in this model system to obtain a d-wave superconducting order, like that observed in real doped cuprate HTSC materials. Using the Lifshitz model for the disorder introduced into system by dopants, we analyze also the nonuniform structure of such a d-wave parameter, including both its magnitude and phase variation. The results indicate that d-wave superconductivity becomes possible in a doped metal until it is destroyed at too high doping levels.

PACS:
71.55.-i - Impurity and defect levels
74.20.-z - Theories and models of superconducting state
74.20.Fg - BCS theory and its development
74.62.Dh - Effects of crystal defects, doping and substitution
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)