Infrared spectroscopy of complex oxides of phase separated manganites and electron-doped cuprates

Our study examined the infrared optical properties of complex oxides of phase separated manganite thin films and electron-doped cuprates as a function of temperature and magnetic field covering a range of doping on various substrates. The principal conclusion of this study for manganites is that low energy optical properties are sensitive to phase separation in manganites. The optical constants indicate a percolative type of insulator-metal transition and effective electron density analyzes indicate that with large cation disorder, the description of the optical conductivity is not amenable to mean field models of double exchange and Jahn-Teller distortions. The magneto-optic study of electron-doped cuprates indicate that the optical properties are unaffected by the application of magnetic fields of 31T.