School and Workshop on Space Plasma Physics
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T. M. Mishonov, J. O. Indekeu, and E. S. Penev (2003)
Superconductivity of overdoped cuprates: the modern face of the ancestral two-electron exchange
J. Phys.: Condens. Matter 15(25):4429--4456.
Abstract
The single-site two-electron exchange amplitude J_sd between the Cu 4s and Cu 3dx2-y2 states is found to be the pairing mechanism of high-Tc overdoped cuprates. The noninteracting part of the Hamiltonian spans the copper Cu 4s, Cu 3dx2-y2 and oxygen O 2px and O 2py 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 data. The basic thermodynamic and electrodynamic properties of the model (specific heat C(T) and London penetration depth lambda(T)) are analytically derived. These are directly applicable to cuprates without complicating structural accessories (chains, double CuO2 planes etc). We advocate that the pairing mechanism of overdoped and underdoped cuprates is the same, as Tc displays smooth doping dependence. Thus, a long-standing puzzle in physics is possibly solved.
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Preprint: cond-mat/0209191
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The s-d theory turns 5
