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In the colossal magnetoresistance manganites polarons have been proposed asthe charge carrier state which localizes across the metal-insulator transition.The character of the polarons is still under debate. We present an assessmentof measurements which identify polarons in the metallic state ofLa{2/3}Sr{1/3}MnO{3} (LSMO) and La{2/3}Ca{1/3}MnO{3} (LCMO) thin films. Wefocus on optical spectroscopy in these films which displays a pronouncedresonance in the mid-infrared. The temperature dependent resonance has beenpreviously assigned to polaron excitations. These polaronic resonances arequalitatively distinct in LSMO and LCMO and we discuss large and small polaronscenarios which have been proposed so far. There is evidence for a largepolaron excitation in LSMO and small polarons in LCMO. These scenarios areexamined with respect to further experimental probes, specifically chargecarrier mobility (Hall-effect measurements) and high-temperaturedc-resistivity.Comment: 16 pages, 10 figure

Polaronic excitations in colossal magnetoresistance manganite films