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An Evaluation of Pseudo Gap in High Tc-Superconductor using Pairing Scenario of Nozieres and Schmitt Rink Theory

Shreemant Ramana and L. K. Mishra

In this paper, we have studied the pseudo gap through pairing scenario based on Nozieres and Schmitt-Rink theory. The central theme of this theory is the Cross-over problem from BCS superconductivity to Bose-Einstein Condensation (BEC). Pseudo gap state is regarded as a cross-over region. There is a co-existence of Fermions and Bosons in this region. Evaluating the self-energy from Tmatrix approach, we have studied the pseudo gap in the single particle excitation.