Abstract
Phonon energies in lanthanum manganites have been determined by dispersing powder in alkali halide matrices and measuring the absorption of far-infrared radiation. The method is illustrated with the classic colossal magneto-resistance material La 0.7Ca 0.3MnO 3. Relative to this, phonon energies associated with the Mn site are found to increase as Li is substituted for Mn. In the absence of Ca substituting for La, a new phonon mode is observed.
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