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首页> 外文会议>Proceedings vol.2004-12; Electrochemical Society(ECS) Annual Spring Meeting and International Symposium on Fullerenes, Nanotubes, and Carbon Nanoclusters; 20040509-13; San Antonio,TX(US) >LOW CARRIER DENSITY ORGANIC CONDUCTORS: UNCONVENTIONAL ELECTRON-PHONON COUPLING AND SUPERCONDUCTIVITY
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LOW CARRIER DENSITY ORGANIC CONDUCTORS: UNCONVENTIONAL ELECTRON-PHONON COUPLING AND SUPERCONDUCTIVITY

机译：低载流子密度的有机导体：非常规的电子声子耦合和超导性

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摘要

C_(60)-based materials, as many other fullerene and organic compounds, are characterized by an extremely low density of charge carriers n, one or more orders of magnitudes smaller than conventional metals. Nonadiabatic effects in low carrier density metals arise when the Fermi energy E_F ～ n~(2/3) is of the same order of the vibrational energy scale ω_(ph), whereas in conventional metals ω_(ph) E_F. In this situation the adiabatic assumption ω_(ph) E_F underlying the conventional Migdal-Eliashberg theory breaks down and nonadiabatic effects are needed to be taken into account. The onset of nonadiabatic effects leads to an unconventional electron-phonon phenomenology. We discuss the anomalous features related to the nonadiabatic nature of the electron-phonon interaction and in particular the implications concerning the superconducting pairing, which results enhanced because to the opening of new channels of interaction. The possible connections between fullerenes and other high-T_c superconductors, will be also discussed.
机译：与许多其他富勒烯和有机化合物一样，C_（60）基材料的特征是电荷载流子n的密度极低，比常规金属小一个或多个数量级。当费米能E_F〜n〜（2/3）与振动能级ω_（ph）处于同一数量级时，在低载流子密度金属中会出现非绝热效应，而在常规金属中，它们的非绝热效应则为ω_（ph）<< E_F。在这种情况下，传统Migdal-Eliashberg理论的绝热假设ω_（ph）<< E_F分解，需要考虑非绝热效应。非绝热效应的出现导致了非常规的电子声子现象学。我们讨论了与电子-声子相互作用的非绝热性质有关的异常特征，尤其是与超导配对有关的含义，这是由于开放了新的相互作用通道而导致的。还将讨论富勒烯与其他高T_c超导体之间的可能连接。

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