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• W3210518877 abstract "By means of in situ synchrotron x-ray diffraction and Raman spectroscopy under hydrostatic pressure, we investigate the structural stability of the quadruple perovskite $mathrm{La}{mathrm{Mn}}_{7}{mathrm{O}}_{12}$. At 34 GPa, the data unveil a first-order structural phase transition from monoclinic $I2/m$ to cubic $Imoverline{3}$ symmetry characterized by a pronounced contraction of the unit cell and by a significant modification in the Raman phonon modes. The phase transition is also marked by the suppression of a Jahn-Teller distortion which is present in the ambient monoclinic phase. In addition, above 20 GPa pressure, a sudden and simultaneous broadening is observed in several Raman modes which suggests the onset of a sizable electron-phonon interaction and incipient charge mobility. Considering that $mathrm{La}{mathrm{Mn}}_{7}{mathrm{O}}_{12}$ is a paramagnetic insulator at ambient conditions, and that the Jahn-Teller distortion is frozen in the high-pressure $Imoverline{3}$ phase, we argue that this phase could be a potential candidate to host a purely electronic insulator-metal transition with no participation of the lattice." @default.
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• W3210518877 date "2021-10-26" @default.
• W3210518877 modified "2023-10-14" @default.
• W3210518877 title "Pressure-induced structural phase transition and suppression of Jahn-Teller distortion in the quadruple perovskite structure" @default.
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• W3210518877 doi "https://doi.org/10.1103/physrevmaterials.5.104411" @default.
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