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

Abstract

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.

5 pages, 3 figures

References in corpus (3)

• Theory of Underdoped Cuprates
• On the superconductivity in the system with preformed pairs
• Deviations from Fermi-liquid behavior above $T_c$ in 2D short coherence length superconductors

Cited by in corpus (5)

• Pseudogap in a thin film of a conventional superconductor
• Carrier relaxation, pseudogap, and superconducting gap in high-Tc cuprates: A Raman scattering study
• Pairing fluctuations and pseudogaps in the attractive Hubbard model
• Interlayer Tunneling of Quasiparticles and Cooper Pairs in Bi-2212 Single Crystal Whiskers
• Observation of a common symmetry for the pseudogap and the superconducting order parameter near the surface of underdoped YBCO