HartreeFock computation of the highT_{c} cuprate phase diagram
Abstract
A computation of the cuprate phase diagram is presented. Adiabatic deformability back to the density function band structure plus symmetry constraints lead to a Fermi liquid theory with five interaction parameters. Two of these are forced to zero by experiment. The remaining three are fit to the moment of the antiferromagnetic state at halffilling, the superconducting gap at optimal doping, and the maximum pseudogap. The latter is identified as orbital antiferromagnetism. Solution of the HartreeFock equations gives, in quantitative agreement with experiment, (1) quantum phase transitions at 5% and 16% ptype doping, (2) insulation below 5%, (3) a dwave pseudogap quasiparticle spectrum, (4) pseudogap and superconducting gap values as a function of doping, (5) superconducting T_{c} versus doping, (6) London penetration depth versus doping, and (7) spin wave velocity. The fit points to superexchange mediated by the bonding O atom in the CuO plane as the causative agent of all three ordering phenomena.
 Publication:

Physical Review B
 Pub Date:
 January 2014
 DOI:
 10.1103/PhysRevB.89.035134
 arXiv:
 arXiv:1306.5359
 Bibcode:
 2014PhRvB..89c5134L
 Keywords:

 71.10.Ay;
 74.72.Kf;
 75.30.Et;
 Fermiliquid theory and other phenomenological models;
 Exchange and superexchange interactions;
 Condensed Matter  Superconductivity
 EPrint:
 20 pages of LaTeX, 13 figures