Band spectrum transformation and temperature dependences of thermoelectric power of Hg${}_{1-x}$R${}_x$Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ system

Abstract

Temperature dependences of thermoelectric power S(T) at $T>T_c$ of the Hg-based high temperature superconductors Hg${}_{1-x}$R${}_x$Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ (R=Re, Pb) have been analyzed with accounting for strong scattering of charge carriers. Transformation of parameters of a narrow conducting band in the region of the Fermi level was studied. The existence of correlation between the effective bandwidth and the temperature of a superconductive transition $T_c$ is shown.

6 pages, 4 figures