Brillouin Scattering Studies of La_{0.77}Ca_{0.23}MnO_3 Across Metal-Insulator Transition

Temperature-dependent Brillouin scattering studies have been carried out on La_{0.77}Ca_{0.23}MnO_3 across the paramagnetic insulator - ferromagnetic metal (I-M) transition. The spectra show a surface Rayleigh wave (SRW) and a high velocity pseudo surface acoustic wave (HVPSAW) besides bulk acoustic...

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Bibliographic Details
Published in:arXiv.org 2003-03
Main Authors: Md Motin Seikh, Narayana, Chandrabhas, Sudheendra, L, Sood, A K, Rao, C N R
Format: Article
Language:English
Subjects:
Calcium
Elastic properties
Ferromagnetism
Insulators
Manganese oxides
Metal-insulator transition
Rayleigh waves
Scattering
Surface acoustic waves
Temperature
Temperature dependence
Transition temperature
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Summary:Temperature-dependent Brillouin scattering studies have been carried out on La_{0.77}Ca_{0.23}MnO_3 across the paramagnetic insulator - ferromagnetic metal (I-M) transition. The spectra show a surface Rayleigh wave (SRW) and a high velocity pseudo surface acoustic wave (HVPSAW) besides bulk acoustic waves (BAW). The Brillouin shifts associated with SRW and HVPSAW show blue-shifts, where as the frequencies of the BAW decrease below the I-M transition temperature (T_C) of 230 K. These results can be understood based on the temperature dependence of the elastic constants. We also observe a central peak whose width is maximum at T_C.
ISSN:2331-8422
DOI:10.48550/arxiv.0303029