Phonon‐assisted strong Cooper pair interaction in highly correlated cuprate systems
Phonon‐assisted strong Cooper pair interaction in highly correlated cuprate systems
复制标题
高度相关的铜酸盐系统中声子辅助的强库珀对相互作用
DOI：
10.1063/1.1639571
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. Tachiki
中科院分区：
文献类型：
--
作者：
M. Tachiki
The dispersion of the in‐plane CuO bond stretching LO phonon mode in the high‐TC cuprate superconductors shows strong softening with the optimum doped samples near the zone boundary, but the overdoped samples with zero TC does not show the anomalous softening. This fact suggests that the phonon is closely related to the mechanism of the high‐TC superconductivity. The softening can be described with a negative electronic dielectric function that results in overscreening of the inter‐site Coulomb interaction in the highly correlated cuprate systems. We propose that such a strong electron‐phonon coupling of specific modes can form basis for phonon mechanism of high‐temperature superconductivity. On the basis of the model, with the Eliashberg theory using the experimentally determined electron dispersion and dielectric function, we demonstrate the possibility of superconductivity with the order parameter of the symmetry and the transition temperature well in excess of 100K.
