TEMPERATURE-DEPENDENCE OF THE PHONON FREQUENCIES, LINEWIDTHS, AND RAMAN-CONTINUUM SCATTERING OF SINGLE-DOMAIN Y0.56PR0.44BA2CU3O7

被引：8

作者：

MCCARTY, KF

LIU, JZ

JIA, YX

SHELTON, RN

RADOUSKY, HB

机构：

[1] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616

[2] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.46.11958

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report detailed Raman-scattering measurements from a single-domain crystal of composition Y0.56Pr0.44Ba2Cu3O7 (T(c) = 40 K). Through a polarization analysis, 13 of the 15 Raman-active phonons are unambiguously identified. The frequencies and linewidths of the five A(g) phonons are studied as a function of temperature. Unlike YBa2Cu3O7, there are no pronounced superconductivity-induced changes in phonon frequency and linewidth. At all temperatures, the B1g-like phonon at 320 cm-1 is intrinsically much broader than in YBa2Cu3O7. The linewidths of the 440- and 515-cm-1 phonons decrease sharply with cooling, to an extent that cannot be explained by the simplest model of anharmonic decay. We identify Raman-scattering continua for photons polarized both within and perpendicular to the CuO2 planes. Like YBa2Cu3O7, the CuO2-plane continuum interferes strongly with the phonon scattering at 130 cm-1. Unlike YBa2Cu3O7, the CuO2-plane continuum of Y0.56Pr0.44Ba2O7 has a low-frequency tail that disappears upon cooling.

引用

页码：11958 / 11964

页数：7

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