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arXiv 1002.0998cond-mat.supr-concond-mat.mtrl-sci
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超导体的电子-声子理论:Tc图和顶点修正

The electron-phonon theory of superconductors: Tc map and vertex correction

W. Fan

摘要:

采用强耦合Eliashberg理论加顶点修正计算了表征超导性的参数空间转变温度图。在这些Tc图的基础上,发现了电子-声子相互作用从弱耦合区到强耦合区增加时的交叉行为。特别是顶点修正和库仑相互作用的联合作用可以有效地将标准强耦合理论中的极高Tc值降低到实验中发现的合理值,并成功地解释了铜氧化物超导体的行为相关Tc。强的非绝热效应是轻原子组成的高声子频率化合物的高Tc势垒。

英文摘要:

The strong coupling Eliashberg theory plus vertex correction is used to calculate maps of transition temperature (Tc) in parameter-space characterizing superconductivity. Based on these Tc maps, crossover behaviors are found when electron-phonon interaction increases from weak-coupling region to strong coupling region. Especially, the combined interaction of vertex correction and Coulomb interaction can efficiently depress Tc from extremely high values in standard strong-coupling theory to reasonable values found in experiments and successfully explain the doing-dependent Tc of cuprate superconductors. The strong non-adiabatic effect is the barrier for high-Tc in compounds with compositions of light atoms and with high phonon frequencies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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