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• W2980483355 abstract "We report on the temperature evolution of the infrared-active optical phonons in ${mathrm{FeCr}}_{2}{mathrm{S}}_{4}$ investigated by Fourier-transform infrared spectroscopy. The eigenfrequencies of the four triply degenerate infrared-active ${T}_{1u}$ phonons of the room-temperature cubic spinel structure shift when entering into the ferrimagnetically ordered state below ${T}_{C}=165phantom{rule{4pt}{0ex}}mathrm{K}$ indicating strong spin-phonon coupling as reported earlier. A new mode at 200 ${mathrm{cm}}^{ensuremath{-}1}$ emerges below a temperature ${T}^{*}ensuremath{simeq}115phantom{rule{4pt}{0ex}}mathrm{K}$ and a splitting of the lowest-lying cubic phonon mode at about 120 ${mathrm{cm}}^{ensuremath{-}1}$ appears below the temperature ${T}_{M}ensuremath{approx}60phantom{rule{4pt}{0ex}}mathrm{K}$ associated with the onset of an incommensurate modulation of the magnetic structure. At the transition to the orbitally ordered and ferroelectric ground state at ${T}_{text{OO}}=9phantom{rule{4pt}{0ex}}mathrm{K}$ two more modes emerge at 146 and 253 ${mathrm{cm}}^{ensuremath{-}1}$ in very good agreement with the eigenfrequencies of two of the cubic Raman-active phonon modes reported by Choi et al. [J. Phys. Condens. Matter 19, 145260 (2007)]. These new modes are interpreted as signatures of a symmetry lowering with a loss of inversion symmetry to induce the multiferroic orbitally ordered ground state." @default.
• W2980483355 created "2019-10-25" @default.
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• W2980483355 date "2019-10-18" @default.
• W2980483355 modified "2023-09-27" @default.
• W2980483355 title "Infrared-active phonons in the ferrimagnetic and multiferroic phases ofFeCr2S4: Evidence for structural distortions" @default.
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• W2980483355 doi "https://doi.org/10.1103/physrevb.100.144428" @default.
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