IMPULSIVE LIGHT-SCATTERING BY COHERENT PHONONS IN LAALO3 - DISORDER AND BOUNDARY EFFECTS

被引：45

作者：

LIU, Y

FRENKEL, A

GARRETT, GA

WHITAKER, JF

FAHY, S

UHER, C

MERLIN, R

机构：

[1] UNIV MICHIGAN,HARRISON M RANDALL LAB PHYS,ANN ARBOR,MI 48109

[2] NATL UNIV IRELAND UNIV COLL CORK,DEPT PHYS,CORK,IRELAND

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.75.334

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Pump-probe measurements of coherent-phonon-induced changes of refractive index in LaAlO3 are dominated by normally weak boundary effects. Atomic displacements in the range 50-500 μÅ were generated and probed by femtosecond laser pulses through impulsive Raman scattering. The absence of a bulk contribution is ascribed to phase mismatch due to domain disorder. Selection rules are consistent with a Raman model considering reflection and transmission at interfaces. Intensities and phonon parameters as a function of temperature agree well with incoherent Raman data. © 1995 The American Physical Society.

引用

页码：334 / 337

页数：4

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