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arXiv 0906.2286cond-mat.supr-con
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Fe和As基化合物的超导电性:MgB2和铜酸盐之间的桥梁

Superconductivity in Fe and As based compounds: a bridge between MgB2 and cuprates

A. Bussmann-Holder, A. Simon, H. Keller, A. R. Bishop

摘要:

通过解释各种实验数据的新的高温FeAs型超导体的晶格介导的多间隙超导性,它表明,这些系统强烈类似于MgB 2,然而,与局部极化晶格效应存在的区别。这一事实建立了一个连接到铜氧化物高温超导体,其中极化子的形成是必不可少的赝能隙相和非常规的同位素效应观察。然而,类似于MgB 2,与铜酸盐相反,Fe-As基材料中的两个超导带隙是各向同性的s波带隙。

英文摘要:

By interpreting various experimental data for the new high temperature FeAs type superconductors in terms of lattice mediated multi gap superconductivity, it is shown that these systems strongly resemble MgB2, however, with the distinction that local polaronic lattice effects exist. This fact establishes a connection to cuprate high temperature superconductors where polaron formation is essential for the pseudogap phase and the unconventional isotope effects observed there. However, similar to MgB2 and in contrast to cuprates the two superconducting gaps in the Fe-As based materials are isotropic s-wave gaps.

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