  Unusual temperature and doping dependence of the Mn 3d spectral functions of
manganese perovskites Nd1-xSrxMnO3 has been revealed by the high-resolution Mn
2p-3d resonance photoemission. The temperature-dependent spectra cannot be
explained by any theoretical model currently under debate, while showing
evidence for a microscopic and dynamic phase segregation. The experimental
results strongly suggest that the competition of both the dynamical and static
Jahn-Teller effects with ferromagnetic ordering at high and low temperatures,
respectively, is responsible for the actual electronic states.
