Superconductivity of overdoped cuprates: the modern face of the ancestral two-electron exchange

The single-site two-electron exchange amplitude Jsd 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 tr...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2003-07, Vol.15 (25), p.4429-4456
Main Authors: Mishonov, T M, Indekeu, J O, Penev, E S
Format: Article
Language:English
Subjects:
Bcs theory and its development
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Superconductivity
Theory and models of superconducting state
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Summary:The single-site two-electron exchange amplitude Jsd 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 *Dp 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 *l (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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/15/25/312