Optical conductivity of manganites: Crossover from Jahn-Teller small polaron to coherent transport in the ferromagnetic state

We report on the optical properties of the hole-doped manganites Nd0.7Sr0.3 MnO3, La0.7Ca0.3MnO3, and La0.7Sr0.3MnO3. The low-energy optical conductivi ty in the paramagnetic-insulating state of these materials is characterized by a broad maximum near 1 eV. This feature shifts to lower energy and grow s in optical oscillator strength as the temperature is lowered into the fer romagnetic state. It remains identifiable well below T-c and transforms eve ntually into a Drude-like response. This optical behavior and the activated transport in the paramagnetic state of these materials are consistent with a Jahn-Teller small polaron. The optical spectra and oscillator strength c hanges compare well with models that include both double exchange and the d ynamic Jahn-Teller effect in the description of the electronic structure. [ S0163-1829(98)06848-9].