Role of Inter-Electron Interaction in the Pseudo-Gap Opening in High T $_c$ Tunneling Experiments

Details Role of Inter-Electron Interaction in the Pseudo-Gap Opening in High T $_c$ Tunneling Experiments Role of Inter-Electron Interaction in the Pseudo-Gap Opening in High T $_c$ Tunneling Experiments

1998-05-09

arxiv.org/abs/cond-mat/9805105v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.59.R11675

The analysis of tunneling experiments showing the pseudogap type behavior is carried out based on the idea of the renormalization of density of states due to the inter-electron interaction in the Cooper channel (superconducting fluctuations contribution in tunneling current). It is demonstrated that the observed kink of the zero-bias conductance $G(0,T)$ of $YBaCuO/Pb$ junctions in the vicinity of $T_c$ can be explained in terms of fluctuation theory in a quite wide range of temperature above $T_c$, using the values of microscopic parameters of the $YBaCuO$ electron spectrum taken from independent experiments. The approach proposed also permits to explain qualitatively the shape of the tunneling anomalies in $G(V,T)$ and gives a correct estimate for the pseudogap position and amplitude observed in the experiments on $BiSrCaCuO$ junctions.

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