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• W1985010947 abstract "We present polarized Raman spectra of ${mathrm{CaMn}}_{2}{mathrm{O}}_{4}$ (marokite) measured in several exact scattering configurations from oriented single crystals. Most of the 11A${}_{g}$ + 12B${}_{1g}$ + 10B${}_{2g}$ + 9B${}_{3g}$ Raman-allowed modes are identified and assigned to definite atomic motions by comparison to the predictions of ab initio lattice dynamical calculations. The Raman modes at 474 cm${}^{ensuremath{-}1}$ (${A}_{g}$), 478 cm${}^{ensuremath{-}1}$ (${B}_{1g}$), and 614 cm${}^{ensuremath{-}1}$ (${B}_{1g}$) exhibit anomalous softening at temperatures below ${T}_{mathrm{N}}ensuremath{approx}220$ K due to a spin-phonon coupling which depends strongly on the phonon eigenvectors. There are no indications for a structural transition in the temperature range between 80 and 850 K. We argue quantitatively that the mechanism of the phonon softening below ${T}_{mathrm{N}}$ is similar to that in the undoped manganese perovskites." @default.
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• W1985010947 date "2014-05-30" @default.
• W1985010947 modified "2023-10-16" @default.
• W1985010947 title "Lattice dynamics and spin-phonon coupling in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>CaMn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>: A Raman study" @default.
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• W1985010947 doi "https://doi.org/10.1103/physrevb.89.184307" @default.
• W1985010947 hasPublicationYear "2014" @default.
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