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摘要
The Hartree-Fock-Popov theory of interacting Bose particles is generalized to the Cooper-pair system with a screened Coulomb repulsive interaction in high-temperature superconductors. At zero temperature, we find that the condensate density n(c)(0) of Cooper pairs and the phonon velocity c(0) are dome-shaped functions of the p hole concentration delta. At finite temperature T, we find that the condensate fraction n(c)(T)/n and the phonon velocity c(T) decrease continuously from n(c)(0)/n or c(0) to zero as T increases from zero to the transition temperature Tc. The Cooper-pair system undergoes a first-order phase transition from the normal state to the Bose condensed state.
- 出版日期2013-11-1
- 单位华中科技大学
