在有机电荷转移固体、钴酸盐、尖晶石和富勒烯中，相关电子超导性背后是否有一个共同的主题？
Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels and fullerides?
摘要：
我们认为，在上述看似非常不同的材料之间存在着深刻而根本的关系。导电有机电荷转移固体和层状钴酸盐中电子行为的载流子浓度依赖性非常相似。这些依赖性可以在一个单一的理论模型中得到解释，即具有显著最近邻库仑排斥的扩展哈伯德哈密顿量。有趣的是，钴酸盐中的超导性似乎被限制在能带填充精确或接近四分之一，就像在有机物中一样。我们表明，动态Jahn-Teller效应和由此产生的轨道排序可以导致1/4填充带描述超导尖晶石和富勒烯，这表明强电子-电子和电子-声子相互作用的证据。反铁磁晶格扩张bcc M $_3$ C $_{60}$和超导体中的轨道排序在我们的模型中是不同的。强关联、四分之一填充带和晶格阻挫是这些不寻常超导体的共同特征。
英文摘要：
We posit that there exist deep and fundamental relationships between the above seemingly very different materials. The carrier concentration-dependences of the electronic behavior in the conducting organic charge-transfer solids and layered cobaltates are very similar. These dependences can be explained within a single theoretical model, - the extended Hubbard Hamiltonian with significant nearest neighbor Coulomb repulsion. Interestingly, superconductivity in the cobaltates seems to be restricted to bandfilling exactly or close to one-quarter, as in the organics. We show that dynamic Jahn-Teller effects and the resultant orbital ordering can lead to 1/4-filled band descriptions for both superconducting spinels and fullerides, which show evidence for both strong electron-electron and electron-phonon interactions. The orbital orderings in antiferromagnetic lattice-expanded bcc M$_3$C$_{60}$ and the superconductor are different in our model. Strong correlations, quarter-filled band and lattice frustration are the common characteristics shared by these unusual superconductors.
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