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• W2022195767 endingPage "12346" @default.
• W2022195767 startingPage "12337" @default.
• W2022195767 abstract "In the framework of the study of structural phase transitions in fluoroperovskites AM${mathrm{F}}_{3}$, sodium manganese fluoride ${mathrm{NaMnF}}_{3}$ is especially interesting because it is a rare distorted perovskite that can be obtained easily as a monodomain sample in an orthorhombic low-temperature phase. X-ray experiments were performed to confirm this quasimonodomain character. Raman spectra of ${mathrm{NaMnF}}_{3}$ were recorded and interpreted between 40 and 573 K. From group-theory analysis it was shown that the orthorhombic-cubic high-temperature phase transition which occurs in ${mathrm{NaMnF}}_{3}$ can be imputed to the condensation of vibrational modes located at the ensuremath{Gamma}, R, M, and X points of the first cubic Brillouin zone. Assuming that the Raman modes which are not responsible for the transition are temperature independent and with help from compatibility diagrams, frequencies of high-symmetry zone boundary modes in the high-temperature phase (cubic symmetry) were deduced only from experimental data obtained in the orthorhombic phase. Consequently these data were used to adjust the parameters of a rigid-ion model in the ideal cubic phase. The calculated phonon spectrum and the phonon density of states were deduced. The calculated cubic elastic constants ${mathit{C}}_{11}$, ${mathit{C}}_{12}$, ${mathit{C}}_{44}$ are consistent with the elastic constants measured by Brillouin scattering in the quasicubic approximation. Moreover, the reported Raman study provides evidence for the occurrence of a two-magnon scattering due to antiferromagnetic character below ${mathit{T}}_{mathit{N}}$ =60 K with persistence of a broad line above the N'eel temperature." @default.
• W2022195767 created "2016-06-24" @default.
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• W2022195767 date "1995-05-01" @default.
• W2022195767 modified "2023-10-18" @default.
• W2022195767 title "Raman scattering study and lattice-dynamics investigation of theNaMnF3perovskite" @default.
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• W2022195767 doi "https://doi.org/10.1103/physrevb.51.12337" @default.
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