Physics – Condensed Matter – Superconductivity
Scientific paper
2007-03-12
Physics
Condensed Matter
Superconductivity
5 pages, 1 figure
Scientific paper
We show that the ideal gas of Bogolyubov quasi-particles (IGBQ) of 2D Coulomb Bose gas provides c \sim T^4 and c \sim T (from plasmon and free particle parts of quasi-particles, respectively) temperature dependencies of the specific heat. This can in a framework of Drude model interpret the observed low-temperature heat conductivity \kappa \sim T^{3.6} and \kappa \sim T of pseudogap quasi-particles of cuprate superconductors. Vanishing of free quasi-particles of IGBQ in the transition to plasmons determines the downturn behavior of \kappa and clarifies the origin of decoupling of charge carriers with heat. Near to pseudogap boundary Bose gas transforms into Fermi gas of holes or electrons. Obtained from mixture of Bose and Fermi gases Lorentz ratio values of Wiedemann -- Franz law (WFL) are close to observed non-Fermi liquid ones. The observed temperature dependence of entropy can be result of the specific heat contributions from these both gases.
Abdullaev Bakhodir
Park Cheol-Hwan
Park Kwan-Suk
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