  Raman scattering experiments have been carried out on single crystals of
Nd$_{0.5}$Sr$_{0.5}$MnO$_3$ as a function of temperature in the range of 320-50
K, covering the paramagnetic insulator-ferromagnetc metal transition at 250 K
and the charge-ordering antiferromagnetic transition at 150 K. The diffusive
electronic Raman scattering response is seen in the paramagnetic phase which
continue to exist even in the ferromagnetic phase, eventually disappearing
below 150 K. We understand the existence of diffusive response in the
ferromagnetic phase to the coexistence of the different electronic phases. The
frequency and linewidth of the phonons across the transitions show significant
changes, which cannot be accounted for only by anharmonic interactions.
