Abstract

Abstract Starting from the model of spin-dielectric polarons proposed by the author and others, it is suggested that all the carriers (oxygen 2p holes) form bipolarons, and that they are responsible for the current above and below T c. A comparison is made with superfluid 4He in which only 10% of the helium atoms are believed to condense into the zero-momentum state. A similar assumption for the superconductors can account for the small values of the change of entropy through the transition. The model breaks down for concentrations (x) of carriers so great that Tc decreases with x, for which overlap between the polarons may lead to BCS behaviour with breakup of the bosons above Tc , but not necessarily phonon-induced pairing. It is suggested also that the model is compatible with observations of a Fermi surface.

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