Electronic Raman scattering and photoluminescence from La$_{0.7}$Sr$_{0.3}$MnO$_3$ exhibiting giant magnetoresistance

Details Electronic Raman scattering and photoluminescence from La$_{0.7}$Sr$_{0.3}$MnO$_3$ exhibiting giant magnetoresistance Electronic Raman scattering and photoluminescence from La$_{0.7}$Sr$_{0.3}$MnO$_3$ exhibiting giant magnetoresistance

1996-05-13

arxiv.org/abs/cond-mat/9605074v1

Physics

Condensed Matter

10 pages + 4 eps figures, Revtex 3.0, figures available on request

Scientific paper

10.1103/PhysRevB.54.14899

Raman and Photoluminescence (PL) experiments on correlated metallic La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ have been carried out using different excitation wavelengths as a function of temperature from 15 K to 300 K. Our data suggest a Raman mode centered at 1800 cm$^{-1}$ and a PL band at 2.2 eV. The intensities of the two peaks decrease with increasing temperature. The Raman mode can be attributed to a plasmon excitation whose frequency and linewidths are consistent with the measured resistivities. The PL involves intersite electronic transitions of the manganese ions.

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