Volume 57, Number 4, February 2002
|Page(s)||557 - 563|
|Section||Condensed matter: electronic structure, electrical, magnetic, and opticalproperties|
|Published online||01 September 2002|
Electronic vibrons and possible mechanism for high-temperature superconductivity
Department of Physics, School of Physics and Mathematical
Sciences Loughborough University - LE11 3TU, UK
Accepted: 19 November 2001
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.
PACS: 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nano tubes, and nanocrystals / 71.28.+d – Narrow-band systems; intermediate-valence solids / 71.38.-k – Polarons and electron-phonon interactions
© EDP Sciences, 2002
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