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- W2009777875 abstract "Raman spectra of ${mathrm{La}}_{0.75}{mathrm{Ca}}_{0.25}{mathrm{MnO}}_{3}$ have been collected for the first time over a wide pressure range $(0--14mathrm{GPa})$ using a diamond anvil cell. The frequency range explored $(200--1100{mathrm{cm}}^{ensuremath{-}1})$ and the very good quality of the data allowed us to carefully analyze the pressure evolution of the phonon modes of the ${mathrm{MnO}}_{6}$ octahedra. The results show an abrupt transition at $ensuremath{sim}7.5mathrm{GPa}$ with an evident deviation from the linear trend of the frequency of the Jahn-Teller phonon versus the applied pressure, accompanied by a strong phonon broadening. This behavior disagrees with the predicted insulator to metal transition and, on the contrary, indicates the occurrence of a new unpredicted phase in the very high pressure regime." @default.
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- W2009777875 date "2001-02-12" @default.
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- W2009777875 title "Anomalous High Pressure Dependence of the Jahn-Teller Phonon in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.75</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>0.25</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></…" @default.
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- W2009777875 doi "https://doi.org/10.1103/physrevlett.86.1251" @default.
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