Bulg. J. Phys. vol.38 no.1 (2011), pp. 106-112



Correlation between Tc and the Cu 4s Level Reveals the Mechanism of High-Temperature Superconductivity

Z.D. Dimitrov, S.K. Varbev, K.J. Omar, A.A. Stefanov, E.S. Penev, T.M. Mishonov
Department of Theoretical Physics, Faculty of Physics, University of Sofia, 5 James Bourchier Blvd., BG-1164 Sofia, Bulgaria
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 the century standing puzzle is already solved.

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