Abstract
Abstract The Fröhlich electron-phonon interaction in cuprates and other charge-transfer oxides is shown to be much stronger than any magnetic interaction. The polaron shift due to the Fröhlich interaction of about 1 eV suggests that carriers are smali (bi)polarons at all temperatures and dopings, in agreement with the oxygen isotope effect on the carrier mass, optical conductivity and other experimental observations. Two distinct energy scales, the d-wave superconducting order parameter and charge segregation in the form of stripes in cuprates, are unified in the framework of the bipolaron theory as a result of the formation of mobile bipolarons in the normal state and their Bose-Einstein condensation. Within the theory both the d-wave superconducting order parameter and the striped charge distribution result from the bipolaron (centre-of-mass) energy band dispersion rather than from any particular interaction.
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