Charge pairing and superconductivity in high-Tc cuprate superconductors

Details Charge pairing and superconductivity in high-Tc cuprate superconductors Charge pairing and superconductivity in high-Tc cuprate superconductors

2001-11-09

arxiv.org/abs/cond-mat/0111149v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

We propose a model for high-Tc superconductors that includes both the spin fluctuations of the Cu++ magnetic ions and of the spins of O-- doped holes (spinons). The charge of the dopants (holons) is associated to quantum skyrmion excitations of the Cu++ spin background. The quantum skyrmion effective interaction potential is evaluated as a function of doping and temperature, indicating that Cooper pair formation is determined by the competition between these two types of spin fluctuations. The superconducting transition occurs when the effective potential allows for skyrmion bound states. Our theoretical predictions for the superconducting phase diagram of LSCO and YBCO are in good agreement with experiment.

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