Issue |
Europhys. Lett.
Volume 57, Number 4, February 2002
|
|
---|---|---|
Page(s) | 557 - 563 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and opticalproperties | |
DOI | https://doi.org/10.1209/epl/i2002-00498-4 | |
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
Received:
3
August
2001
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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