A Raman Spectroscopy Study of Disorder and Local Vibrational Modes in ({ m{L}}{{ m{a}}_{{ m{0: 7}}}}{ m{S}}{{ m{r}}_{{ m{0: 3}}}}{ m{M}}{{ m{n}}_{{ m{1 - x}}}}{{ m{M}}_{ m{x}}}{{ m{O}}_{ m{3}}}) (M=Fe, Co)

In the paper "A Raman Spectroscopy Study of Disorder and Local Vibrational Modes in \({\rm{L}}{{\rm{a}}_{{\rm{0:7}}}}{\rm{S}}{{\rm{r}}_{{\rm{0:3}}}}{\rm{M}}{{\rm{n}}_{{\rm{1 - x}}}}{{\rm{M}}_{\rm{x}}}{{\rm{O}}_{\rm{3}}}\) (M=Fe, Co)", the authors present results of Raman scattering and X-ray diraction studies of \({\rm{L}}{{\rm{a}}_{{\rm{0:7}}}}{\rm{S}}{{\rm{r}}_{{\rm{0:3}}}}{\rm{M}}{{\rm{n}}_{{\rm{1 - x}}}}{{\rm{M}}_{\rm{x}}}{{\rm{O}}_{\rm{3}}}\) (M=Fe, Co) manganites. Some Mn atoms were replaced by Fe and Co with x in the range of 0.0 { 0.75. XRD analysis of these samples indicates a change in the cell parameters with doping content. This research main focus is the Raman peak at high frequency \({\rm{( > 630 c}}{{\rm{m}}^{{\rm{ - 1}}}}{\rm{ )}}\), which is somewhat controversial. The Raman spectra exhibit an additional high-frequency mode attributed to a local breathing vibration of the oxygen surrounding the substituent ion.
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A Raman Spectroscopy Study of Disorder and Local Vibrational Modes in \({\rm{L}}{{\rm{a}}_{{\rm{0:7}}}}{\rm{S}}{{\rm{r}}_{{\rm{0:3}}}}{\rm{M}}{{\rm{n}}_{{\rm{1 - x}}}}{{\rm{M}}_{\rm{x}}}{{\rm{O}}_{\rm{3}}}\) (M=Fe, Co)