Gap and subgap tunnelling in cuprates

Abstract

We describe strongly attractive carriers in cuprates in the framework of a simple quasi-one dimensional Hamiltonian with a local attraction. In contrast with the conventional BCS theory there are two energy scales, a temperature independent incoherent gap ${\Delta }_p$ and a temperature dependent coherent gap ${\Delta }_c(T)$ combining into one temperature dependent global gap $\Delta =({\Delta }_p^2+{\Delta }_c^2{)}^{1/2}$. The temperature dependence of the gap and single particle (Giaver) tunnelling spectra in cuprates are quantitatively described. A framework for understanding of two distinct energy scales observed in Giaver tunnelling and electron-hole reflection experiments is provided.

9 pages (RevTex), 4 postscript figures, typos corrected

References in corpus (1)

• Evidence for coexistence of the superconducting gap and the pseudo - gap in Bi-2212 from intrinsic tunneling spectroscopy

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