Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
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DOI：
10.1103/physrevb.82.064518
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发表时间：
2010-05
影响因子：
3.7
通讯作者：
Y. Yanagi;Y. Yamakawa;Naoko Adachi;Y. Ono
中科院分区：
文献类型：
--
作者：
Y. Yanagi;Y. Yamakawa;Naoko Adachi;Y. Ono
研究了A1G、B1G和Eg局域声子耦合的二维16带d-p模型的电子态和超导电性，得到了丰富的相图，包括库仑和电子-声子相互作用参数平面上的磁有序相、电荷有序相和轨道有序相。当电子-声子相互作用占主导地位时，电荷涨落导致S++波超导；当库仑相互作用占主导地位时，磁涨落引起S+波超导。值得注意的是，由于库仑相互作用和电子-声子相互作用的协同作用，轨道涨落得到了增强，并诱发了S++波和节点S+波的超导性。
We study the electronic states and the superconductivity in the two-dimensional 16-band d-p model coupled with A1g, B1g and Eg local phonons and obtain the rich phase diagram including the magnetic, charge and orbital ordered phases on the parameter plane of the Coulomb and electron-phonon interactions. When the electron-phonon interaction is dominant, the charge fluctuations induce the s++ wave superconductivity, while when the Coulomb interaction is dominant, the magnetic fluctuations induce the s+- wave superconductivity. Remarkably, the orbital fluctuations are enhanced due to the cooperative effects of the Coulomb and electron-phonon interactions and induce the s++ wave and the nodal s+- wave superconductivities.