Simple-Decoupling Treatment of High-Tc Superconductors
The t-J model is examined within the framework of the Hubbard-I-type decoupling method of the Green’s functions and by using the Fukuyama’s expression for Hall coefficient R H. The superconducting transition temperature T c and the normal-state R H at finite temperature are calculated as functions of doping-fraction δ. The obtained results are symmetrical with respect to hole- and electron-doping. In the small hole-doping case, the extended s-wave state is favorable, and the behaviors of T c and R H as functions of δ are qualitatively in agreement with the experimental results.
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