Electronic and vibrational Raman spectroscopy of NdSrMnO through the phase transitions
arXiv:cond-mat/0504499
Abstract
Raman scattering experiments have been carried out on single crystals of NdSrMnO 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.
10 pages, 3 figures published in Pramana - Journal of Physics