Abstract
A series of experimental evidences has been recently established on “ the Correlations of Novel Spectral Photoconductivity with Superconductivity ” in the La 2 –Cu 1 –O z , Y 1 –Cu 2 –O z , and Y 3- x –Ba x –Cu 3 –O 9- y systems, which clearly feature the excitons and polarons in the Cu 2 O-like part in these systems with various degrees of oxygen deficiency. On the basis of these results as the silhouette induced by photoexcitation, we propose here a possibility of the realistic mechanism of the formations of pairs and eventually of “ a coherent ensemble of united polarons and excitons ” in the ground state of the high- T c superconductivity. We condense our idea into a term of “ the exciton-mediated bipolarons ”.
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