Electronic inhomogeneities, electron-lattice and pairing interactions in high-Tc superconductors

被引:5
作者
Bill, A [1 ]
Hizhnyakov, V
Nevedrov, D
Seibold, G
Sigmund, E
机构
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[2] Tartu State Univ, Inst Phys, EE-2400 Tartu, Estonia
[3] BTU Cottbus, Inst Theoret Phys, D-03013 Cottbus, Germany
来源
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1997年 / 104卷 / 04期
关键词
D O I
10.1007/s002570050522
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The presence of electronic inhomogeneities strongly reduces the screening of the electron-ion interaction in high-temperature superconductors. This implies the existence of an non-totally screened long-range contribution to the electron-lattice coupling and opens an additional channel for the formation of copper pairs. We calculate the superconducting order parameter taking into account a) the long-range and the short-range parts of the electron-lattice interaction and b) the Coulomb repulsion between charge-carriers. We show that whereas the long-range electron-lattice coupling determines the anisotropy of the order parameter, the Coulomb repulsion and the short-range interactions determine its symmetry. Thus, different high-T-c superconductors may have s- or d-wave symmetry, depending on the relative strength of the interactions involved in the pairing.
引用
收藏
页码:753 / 757
页数:5
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