OPTICAL PHONONS OF CA1.8SR0.2CUO3 WITH THE CU-O CHAIN STRUCTURE

被引：38

作者：

YOSHIDA, M ^{[1
]}

TAJIMA, S ^{[1
]}

KOSHIZUKA, N ^{[1
]}

TANAKA, S ^{[1
]}

UCHIDA, S ^{[1
]}

ISHIBASHI, S ^{[1
]}

机构：

[1] UNIV TOKYO,FAC ENGN,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.44.11997

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman and ir spectra of Ca1.8Sr0.2CuO3 with the Cu-O chain structure have been investigated. Scattering peaks due to Raman-allowed A(g)-mode phonons have been observed at 306 and 530 cm-1 at room temperature for the polarization of light along the a and c axes. On the other hand, when the polarization is along the b axis (chain direction), Raman-forbidden peaks have been observed at 235, 440, 500, and 690 cm-1 with strong second-order features, which show strong resonance enhancement at the charge-transfer gap energy of 2.0 eV. They are ascribed to the zone-boundary phonons, which appear through the strong coupling of the electron-hole pair excited on the Cu-O chain with phonons associated with the motion of atoms in the chain.

引用

页码：11997 / 12002

页数：6

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