Two-dimensional Bose-Einstein Condensation in Cuprate Superconductors
M. Casas, M. de Llano, A. Puente, A. Rigo, M. A. Solis
Abstract
Transition temperatures Tc calculated using the BCS model electron-phonon interaction without any adjustable parameters agree with empirical values for quasi-2D cuprate superconductors. They follow from a two-dimensional gas of temperature-dependent Cooper pairs in chemical and thermal equilibrium with unpaired fermions in a boson-fermion (BF) statistical model as the Bose-Einstein condensation (BEC) singularity temperature is approached from above. The linear (as opposed to quadratic) boson dispersion relation due to the Fermi sea yields substantially higher Tc's with the BF model than with BCS or pure-boson BEC theories.
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