Electronic vibrons and possible mechanism for high-temperature superconductivity

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 t...

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Bibliographic Details
Published in:Europhysics letters 2002-02, Vol.57 (4), p.557-563
Main Author: Kusmartsev, F. V
Format: Article
Language:English
Subjects:
71.28.+d
71.38.-k
73.22.-f
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary: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 $\un{s}$. 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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2002-00498-4