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Journal Article

Ambient-temperature high-pressure-induced ferroelectric phase transition in CaMnTi2O6


Bernert,  Thomas
Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Ruiz-Fuertes, J., Bernert, T., Zimmer, D., Schrodt, N., Koch-Müller, M., Winkler, B., et al. (2017). Ambient-temperature high-pressure-induced ferroelectric phase transition in CaMnTi2O6. Physical Review B, 96(9): 094101. doi:10.1103/PhysRevB.96.094101.

Cite as: https://hdl.handle.net/21.11116/0000-0000-F769-4
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.