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

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.

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 Creators:
Ruiz-Fuertes, J.1, Author
Bernert, Thomas2, Author              
Zimmer, D.3, Author
Schrodt, N.3, Author
Koch-Müller, M.4, Author
Winkler, B.3, Author
Bayarjargal, L.3, Author
Popescu, C.5, Author
MacLeod, S.6, 7, Author
Glazyrin, K.8, Author
Affiliations:
1MALTA-Consolider Team, Departament de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain, ou_persistent22              
2Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
3Institut für Geowissenschaften, Goethe-Universität, Altenhöferallee 1, 60438 Frankfurt am Main, Germany, ou_persistent22              
4GFZ Potsdam, Sektion 4.3, Telegrafenberg, 14473 Potsdam, Germany, ou_persistent22              
5CELLS-ALBA Synchrotron Light Facility, 08290 Cerdanyola del Vallés, Barcelona, Spain, ou_persistent22              
6Atomic Weapons Establishment, Aldermaston, Reading RG7 4PR, United Kingdom, ou_persistent22              
7Institute of Shock Physics, Imperial College London, London SW7 2AZ, United Kingdom, ou_persistent22              
8Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22603 Hamburg, Germany, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2016-05-162017-09-012017-09-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.96.094101
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (9) Sequence Number: 094101 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008