Electronic vibrons and possible mechanism for high-temperature superconductivity

Department of Physics, School of Physics and Mathematical Sciences Loughborough University - LE11 3TU, UK

Received: 3 August 2001
Accepted: 19 November 2001

Abstract

We show that electronic molecules, i.e. bound configurations of electrons within solids, have vibronic modes, which we call electronic vibrons. We derive an analytic expression for the frequency of these vibrons. Our estimation of this frequency made for typical parameters of metallic oxides gives the value of the order 10^-15–10^-14 . Here we show that these vibrons may play an important role in the possible mechanism for a high-temperature superconductivity. We find also that the highest critical temperature for high-temperature superconductivity will have solids with strong electron-vibron coupling (for strongly correlated electrons when the screening is not very strong) and with intermediate electron-phonon coupling. Numerous experimental data in cuprates (an isotope effect, pseudo-gap and a stripe formation) are consistent with the new mechanism.