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

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

dc.contributor.author	Ruiz-Fuertes, Javier
dc.contributor.author	Bernert, T.
dc.contributor.author	Zimmer, D.
dc.contributor.author	Schrodt, N.
dc.contributor.author	Koch-Müller, M.
dc.contributor.author	Winkler, B.
dc.contributor.author	Bayarjargal, L.
dc.contributor.author	Popescu, C.
dc.contributor.author	MacLeod, S.
dc.contributor.author	Glazyrin, K.
dc.date.accessioned	2018-05-17T13:38:41Z
dc.date.available	2018-05-17T13:38:41Z
dc.date.issued	2017
dc.identifier.uri	http://hdl.handle.net/10550/66218
dc.description.abstract	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.
dc.language.iso	eng
dc.relation.ispartof	Physical Review B, 2017, vol. 96, num. 094101
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	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
dc.subject	Ciència dels materials
dc.subject	Espectroscòpia Raman
dc.title	Ambient-temperature high-pressure-induced ferroelectric phase transition in CaMnTi2O6
dc.type	info:eu-repo/semantics/article
dc.date.updated	2018-05-17T13:38:41Z
dc.identifier.doi	https://doi.org/10.1103/PhysRevB.96.094101
dc.identifier.idgrec	126051