MIDINFRARED OPTICAL-ABSORPTION IN UNDOPED LAMELLAR COPPER OXIDES

被引：140

作者：

PERKINS, JD ^{[1
]}

GRAYBEAL, JM ^{[1
]}

KASTNER, MA ^{[1
]}

BIRGENEAU, RJ ^{[1
]}

FALCK, JP ^{[1
]}

GREVEN, M ^{[1
]}

机构：

[1] MIT,DEPT PHYS,CAMBRIDGE,MA 02139

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.71.1621

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Common optical absorption features are observed near 0.5 eV in four undoped single-crystal copper oxides: La2CuO4, Nd2CuO4, Pr2CuO4, and Sr2CuO2Cl2. These absorption bands are shown to be weakly electric dipole allowed excitations of the CuO2 layers. The features are ascribed to an exciton near 0.4 eV, probably of crystal-field origin, with strong multimagnon sidebands. Our observations provide an important basis for understanding the doped materials.

引用

页码：1621 / 1624

页数：4

共 24 条

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