Investigating the reflectance response dynamics of La0.67Ca0.33MnO3 thin films after excitation by femtosecond laser pulses, we identify for the first time a picosecond relaxation step which only exists below the Curie temperature TC. The relaxation time increases from zero at TC to several picoseconds at low temperatures. The data can be explained with the existence of a magnetization-related effective energy gap, and assuming relaxation between these states to be mediated by a Fröhlich-type electron?lattice interaction.
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