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

Rajeev Gupta·A. K. Sood·R. Mahesh·C. N. R. Rao
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Abstract

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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Rajeev Gupta, A. K. Sood, R. Mahesh, C. N. R. Rao. 1996-05-13. Electronic Raman scattering and photoluminescence from La$_{0.7}$Sr$_{0.3}$MnO$_3$ exhibiting giant magnetoresistance. https://doi.org/10.1103/physrevb.54.14899

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