Abstract
In the theoretical framework of a recently developed first-order mechanism for the superconducting pairing an inverted temperature dependence for the transition between the unpaired and a paired state has been observed. We suggest the existence of a paired state at high temperatures T emerging from an unpaired low-temperature state. The entropy driven stabilization of paired states is the outcome of a T-dependent competition between the electronic energy and the electronic configuration entropy. With increasing T the entropy admixtures to the free energy of a given quantum ensemble can exceed energetic effects. The unusual T-dependence of superconductivity has been derived by cluster calculations in the two-parameter Hubbard approximation. The clusters chosen are of the four-electron-four-center type.
Published Version
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