Band spectrum transformation and temperature dependences of thermoelectric power of Hg_1-xR_xBa₂Ca₂Cu₃O_8+δ system

Abstract

Temperature dependences of thermoelectric power S(T) at T>Tc of the Hg-based high temperature superconductors Hg1-xRxBa2Ca2Cu3O8+δ (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 Tc is shown.

Keywords

• high-temperature superconductivity
• superconductive transition temperature
• thermoelectric power
• narrow conduction band
• peak of density of states
• Fermi level