BEC-driven superconductivity in the cuprates

The authors apply to cuprates a three-fluid ideal boson-fermion statistical model of superconductivity in two dimensions (2D) derived from three extrema of the system Helmholtz free energy (subject to constant total fermion-number) for the BCS model interaction between fermions. The same interactions absent in BCS theory are neglected here. As the ensuing bosonic Cooper pairs move not in vacuum but in a Fermi sea they employ the correct linear--as opposed to the commonly-assumed quadratic--dispersion relation in the center-of-mass momentum (CMM). More importantly, pair breakup beyond a certain (very small) CMM is accounted for. Bose-Einstein condensation (BEC) critical temperatures of about 800 K result for moderate coupling with cuprate parameters