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The little mechanism: A consistent interpretation of high-temperature superconductivity

✍ Scribed by Brent A. Richert; Ewald Schachinger; Roland E. Allen

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
116 KB
Volume
162-164
Category
Article
ISSN
0921-4534

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✦ Synopsis

We consider an excitonic model in which the electron is localized in a ~ orbital on a metal site, and the hole is in a linear combination of R orbitals on the surrounding oxygen sites, with both electron and hole in an insulating LeO, BaO, etc. layer adjacent to a metallic CuO 2 or BiO^ plane.

Even for rather large effective dielectric constants, some of the excltons are z w found to be tightly bound and consequently to have sizable transition densities a (~)~_(x). We e n calculate the attractive carrler-carrler interaction V(q), and use it to estimate the superconducting T as a function of the parameters in the model.

This excltonic mechanism appears to c provide a natural and consistent interpretation of hlgh-temperature superconductivity in both the cuprates and bismuthates.

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Role of phonons in the mechanism of high
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✍ T. Egami; P. Piekarz; J.-H. Chung πŸ“‚ Article πŸ“… 2004 πŸ› Elsevier Science 🌐 English βš– 301 KB

While phonons are generally considered to be irrelevant to the mechanism of high-temperature superconductivity, a large number of experimental results indicate otherwise. We argue that the electron-phonon coupling in strongly correlated electron systems is unconventional, and results in a strong spi