Impulsive Light Scattering by Coherent Phonons in LaAl: Disorder and Boundary Effects
- 10 July 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 75 (2) , 334-337
- https://doi.org/10.1103/physrevlett.75.334
Abstract
Pump-probe measurements of coherent-phonon-induced changes of refractive index in LaAl are dominated by normally weak boundary effects. Atomic displacements in the range 50–500 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.
Keywords
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