A possible pairing mechanism for HTSC: Two-dimensional confinement and Coulomb over-screening
Among all the common properties of HTCS cuprates, the authors build their model on two of them: their high anisotropy, and their extremely low density of charge carriers. The intralayer pairing mechanism is provided by the two-dimensional over-screening of Coulomb repulsion. The c-axis zero point energy restricts this pairing to a low carrier density region. Below a critical density, the system behaves as a two-dimensional confined jellium where the energy gain due to charge pairing is larger than the c-axis localization energy. In the high density region, where the pairing energy cannot compensate the localization energy, the system delocalizes and crosses over to a three-dimensional regime. This competition between binding and confinement energies implies a monotonic decrease of mass anisotropy with doping. Pre-formed pairs which exist below a Mean Field (MF) temperature defined by the binding energy, account for pseudo-gap observations. The superconducting critical temperature {Tc} is given by the Beresinskii-Kosterlitz-Thouless (BKT) transition of the two-dimensional layer, renormalized by quantum phase fluctuations (QPF). QPF account for the metal-insulator transition at very low doping.
- Research Organization:
- Swiss Federal Inst. of Tech., Lausanne (CH)
- OSTI ID:
- 20015115
- Journal Information:
- International Journal of Modern Physics B, Vol. 13, Issue 29-31; Conference: Second International Conference of New Theories, Discoveries and Applications of Superconductors and Related Materials (New{sup 3}SC-2), Las Vegas, NV (US), 06/01/1999; Other Information: PBD: 20 Dec 1999; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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