By Olle Gunnarsson
Alkali-doped fullerides have attracted robust curiosity considering that their creation turned attainable approximately fifteen years in the past. This publication offers contemporary paintings which could resolve interesting difficulties bobbing up from quite a few striking homes. for instance, those solids are superconductors with excessive transition temperatures, even though the similarity among the digital and phonon strength scales may still suppress superconductivity. furthermore, the IoffeвЂ“Regel situation for electric conductivity is strongly violated. The publication exhibits why superconductivity is however attainable, as a result of a neighborhood pairing mechanism. The IoffeвЂ“Regel situation is derived quantum-mechanically, and it truly is defined why the underlying assumptions are violated for fullerides and high-Tc cuprates, for instance. The ebook treats digital and delivery homes, reviewing theoretical and experimental effects. It makes a speciality of superconductivity, electric conductivity and metalвЂ“insulator transitions, emphasizing the electronвЂ“electron and electronвЂ“phonon interactions in addition to the JahnвЂ“Teller influence.
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Additional info for Alkali-Doped Fullerides: Narrow-Band Solids with Unusual Properties
We first show theoretical calculations of the phonon frequencies and the electronphonon coupling, and then we discuss different experimental estimates of the coupling. 1 Calculations of phonon frequencies There have been a number of calculations of the phonon frequencies. 1 we show the results of calculations using the semi-empirical MNDO method, 124 an empirical force-constant model 125 , and the ab initio density functional method 34 in the local density approximation (LDA) , 35 using different numerical methods.
The reason is that the hopping integrals between orbitals on different molecules are small, which makes it natural to focus on the hopping between degenerate orbitals. For instance, if we are interested in the t\u band of a system with N molecules, the 3N tiu molecular orbitals are used as a basis set. In most cases we also neglect the hopping beyond the nearest neighbor molecules. Due to the large separation of the Ceo molecules, we need to take into account the rapid decay of the carbon 2p-orbitals over large distances.
W. The t\u plasmons are particularly interesting for two reasons. Firstly, they have a fairly strong coupling to the t\u electrons, and they should therefore influence the properties of the alkali-doped Ceo compounds quite substantially. We discuss this in the context of photoemission in Sec. 8. Secondly, the t\u plasmons have quite interesting properties by themselves. They show no dispersion within the experimental accuracy, contrary to what is usually observed for plasmons. The broadening is very large, which usually means a decay in electron-hole pair excitations.
Alkali-Doped Fullerides: Narrow-Band Solids with Unusual Properties by Olle Gunnarsson