Physics – Condensed Matter – Superconductivity
Scientific paper
2002-09-09
J. Phys.: Condens. Matter 15, 4429-4456 (2003)
Physics
Condensed Matter
Superconductivity
34 pages, 3 figures, 152 references (updated; more than 250 publications cited), LaTeX2e; Appendix added. This is the final co
Scientific paper
10.1088/0953-8984/15/25/312
The single-site two-electron exchange amplitude J_sd between the Cu 4s and Cu 3d_{x^2-y^2} states is found to be the pairing mechanism of high-T_c overdoped cuprates. The noninteracting part of the Hamiltonian spans the copper Cu 4s, Cu 3d_{x^2-y^2} and oxygen O 2p_x and O 2p_y states. Within the standard BCS treatment an explicit expression for the momentum dependence of the gap Delta_p is derived and shown to fit the angle-resolved photoemission spectroscopy (ARPES) data. The basic thermodynamic and electrodynamic properties of the model (specific heat C(T), London penetration depth lambda(T)) are analytically derived. These are directly applicable to cuprates without complicating structural accessories (chains, double CuO_2 planes, etc.). We advocate that the pairing mechanism of overdoped and underdoped cuprates is the same, as T_c displays smooth doping dependence. Thus, a long-standing puzzle in physics is possibly solved.
Indekeu Joseph O.
Mishonov Todor M.
Penev Evgeni S.
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