Abstract
It is shown that BCS-like scenarios for high- superconductivity based on the extended - model yield a characteristic prediction for , the critical temperature at optimum doping. A pivotal role is played by ( is the next-nearest-neighbor hopping, is the third-neighbor hopping). Because determines the shape of the Fermi surface and the nature of saddle points, it strongly affects . Owing to symmetry, structural differences outside the planes are described exclusively by . This explains semiquantitatively the actual variation of among the various cuprates, with estimated parameters that are consistent with the observed Fermi surfaces.
- Received 8 November 1995
DOI:https://doi.org/10.1103/PhysRevLett.76.4939
©1996 American Physical Society