Electronic Raman scattering from La0.7Sr0.3MnO3 exhibiting giant magnetoresistance

Abstract

Raman scattering experiments on metallic ${\mathrm{La}}_{0.7}$ ${\mathrm{Sr}}_{0.3}$Mn${\mathrm{O}}_3$ 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 attributed to electronic excitations centered at 2100 ${\mathrm{cm}}^{-1\mathrm{}}$ whose intensity decreases with increasing temperature. If the Raman mode is attributed to single-particle excitation associated with the fluctuations of the mass tensor, the decreased intensity would then imply a reduction in the density of states at the Fermi energy with increasing temperature.