Correlation between Tc and the Cu 4s level reveals the mechanism of high-temperature superconductivity
Abstract
Band structure trends in hole-doped cuprates and correlations with Tc are interpreted within the s--d exchange mechanism of high-Tc superconductivity. The dependence of Tc on the position of the copper 4s level finds a natural explanation in the generic Cu 3d, Cu 4s, O 2px and O 2py four-band model. The Cu 3d--Cu 4s intra-atomic exchange interaction is incorporated in the standard BCS scheme. This dependence of Tc in the whole interval of 25--125 K has no alternative explanation at present, and possibly this quarter of a century standing puzzle is already solved.
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