Evolution of the optical properties of single-crystal La1−x SrxMnO3

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An ellipsometric method is used to study the dispersion of the real ɛ 1(ω) and imaginary ɛ 2(ω) parts of the complex dielectric permittivity of single-crystal La1−x SrxMnO3 (x=0.1, 0.2, and 0.3) for energies from 100 meV to 5 eV at room temperature. It is found that, when lanthanum is replaced by strontium, the optical spectrum changes fundamentally. A shift in the main features of the spectrum of initial LaMnO3 at 1.9 and 4.7 eV to lower energies takes place, as well as a partial redistribution of the optical-conductivity spectral weight in the band gap region E<1.7 eV. For compositions with x=0.2 and 0.3, a fine structure of the interband absorption is observed against a background of non-Drude optical conductivity at low energies.