Optical spectra measured on cleaved surfaces of double-exchange ferromagnet La1-xSrxMnO3

Optical reflectivity spectra were measured on cleaved surfaces of La1-xSrxM nO3 single crystals (x = 0.175, T-C = 283K) over the temperature range 10 t o 295 K. The optical conductivity sigma(w) shows, keeping single-component nature, incoherent-to-coherent crossover with an increase of electrical con ductivity. The sigma(w) spectrum of the low-temperature ferromagnetic-metal lic phase (10 K) exhibits a pronounced Drude-like component with large spec tral weight, contrary to the previous result. The present result indicates that the optical spectrum of the manganites is sensitive to condition of sa mple surfaces.