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Ruiz-Fuertes, Javier; Bernert, T.; Zimmer, D.; Schrodt, N.; Koch-Müller, M.; Winkler, B.; Bayarjargal, L.; Popescu, C.; MacLeod, S.; Glazyrin, K.
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This document is a artículoDate2017
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Este documento está disponible también en :
http://hdl.handle.net/10550/66218
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The ferroelectric to paraelectric phase transition of multiferroic CaMnTi2O6 has been investigated at high pressures and ambient temperature by second-harmonic generation (SHG), Raman spectroscopy, and powder and single-crystal x-ray diffraction. We have found that CaMnTi2O6 undergoes a pressure-induced structural phase transition (P42mc→P42/nmc) at ∼7GPa to the same paraelectric structure found at ambient pressure and Tc=630K. The continuous linear decrease of the SHG intensity that disappears at 7 GPa and the existence of a Raman active mode at 244 cm−1 that first softens up to 7 GPa and then hardens with pressure are used to discuss the nature of the phase transition of CaMnTi2O6, for which a dTc/dP=−48 K/GPa has been found. Neither a volume contraction nor a change in the normalized pressure on the Eulerian strain is observed across the phase transition with all the unit-cell volume data following a second-order Birch-Murnaghan equation of state with a bulk modulus of B0=182.95(2)GPa.
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Ruiz-Fuertes, Javier Bernert, T. Zimmer, D. Schrodt, N. Koch-Müller, M. Winkler, B. Bayarjargal, L. Popescu, C. MacLeod, S. Glazyrin, K. 2017 Ambient-temperature high-pressure-induced ferroelectric phase transition in CaMnTi2O6 Physical Review B 96 094101 |
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https://doi.org/10.1103/PhysRevB.96.094101
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