ANOMALOUS SHIFTS OF OXYGEN MODE FREQUENCIES IN LA2-XSRXCUO4, YBA2CU3O7-DELTA, AND TL2BA2CA1-XGDXCU2O8 STUDIED BY PHOTOINDUCED INFRARED-ABSORPTION AND RAMAN-SPECTROSCOPY

被引：44

作者：

MIHAILOVIC, D

FOSTER, CM

VOSS, KF

MERTELJ, T

POBERAJ, I

HERRON, N

机构：

[1] J STEFAN INST, LJUBLJANA, YUGOSLAVIA

[2] DUPONT CO, CENT RES & DEV, EXPTL STN, WILMINGTON, DE 19880 USA

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.44.237

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Comparison of photoinduced local modes (PILM's) of insulating YBa2Cu3O6.3 and Tl2Ba2Ca(1-x)Gd(x)Cu2O8 with Raman spectra of their metallic counterparts suggests that carrier injection anomalously increases the frequencies of phonons involving z-axis apex-oxygen motion in both the dilute (insulator) and concentrated (metallic) limit. In La2CuO4, we observe PILM's whose frequencies suggest a correspondence with the "ghost modes" observed in neutron scattering [Rietschel et al., Physica C 162-164, 1705 (1989)]. These data, together with Raman data on apex-oxygen anharmonicity, enable us to discuss the vibronic mode couplings involved in polaron formation in the three materials.

引用

页码：237 / 241

页数：5

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