Precise Measurement of Optical Reflectivity Spectra Using Defect-Free Surface of La(1-x)Sr(x)MnO(3): Evidence Against Extremely Small Drude Weight

Abstract

Optical reflectivity spectra of La(1-x)Sr(x)MnO(3) (0<=x<=0.30) were measured on cleavage surfaces of single crystals. The optical conductivity $\sigma (w)offerromagnetic-metalLa(0.70)Sr(0.30)MnO(3)ischaracterizedbyaDrude-like-butnotsimpleDrude-componentwithlargespectralweightbelow1.6eV,whichyieldsalargeeffectivecarriernumberN{\ast }_{e}ffconsistentwiththeresultsofHallcoefficientandspecificheatmeasurements.Thepresentresultdemonstratesthatthepreviousresultof"smallDrudeweight"originatesfromthedamageofthesamplesurface.TheSr-substitutioneffectontheelectronicstructureandtheoriginoftheunconventional$σ(w) are also discussed.

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