Momentum-dependent charge transfer excitations in Sr2CuO2Cl2 angle-resolved electron energy loss spectroscopy

被引：59
|
作者：
Wang, YY
Zhang, FC
Dravid, VP
Ng, KK
Klein, MV
Schnatterly, SE
Miller, LL
机构：
[1] NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208
[2] UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221
[3] HONG KONG UNIV SCI & TECHNOL,DEPT PHYS,KOWLOON,HONG KONG
[4] UNIV ILLINOIS,DEPT PHYS,SCI & TECHNOL CTR SUPERCONDUCT,URBANA,IL 61801
[5] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901
[6] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
来源：
PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.77.1809
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in the Cu-O-2 plane. The former show a large energy dispersion similar to 1.5 eV along [110], and the latter appear at a higher energy position (similar to 4.5 eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.
引用
收藏
页码：1809 / 1812
页数：4
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