Comparison of interplanar-boson-exchange models of high-temperature superconductivity—possible experimental tests

Abstract

Semiquantitative tests are considered of models, proposed earlier by this author, in which high Tc superconductivity follows from the exchange of unspecified intermediate bosons (IB) with ω≫ωphonon between fermionic pairs in different CuO2 layers. Earlier predictions of the dependence of Tc(n) on the number n of layers per cluster are extended to include the possibility that Tc(n=1)<∼10 K in the Tl 1201 and 2201 compounds. In common with other authors rapid saturation of Tc(n) with increasing n is found here. Nonetheless, the experimental value of Tc(n=1) in the Tl and Bi systems can play an important role in discriminating between the various models empirically.