Volume 80, Number 2, October 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 September 2007|
Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics
Institute of Physics ASCR - v.v.i. Na Slovance 2, 182 21 Prague 8, Czech Republic
2 Arrhenius Laboratory, Stockholm University - SE-10691 Stockholm
3 Brno University of Technology - Technicka 2896/2, 616 69 Brno, Czech Republic
4 Grenoble High Magnetic Field Lab, CNRS - 25, avenue des Martyrs, Grenoble Cedex 9, France
Accepted: 29 August 2007
Infrared reflectivity and time-domain terahertz transmission spectra of EuTiO3 ceramics revealed a polar optic phonon at 6-300 K whose softening is fully responsible for the recently observed quantum paraelectric behaviour. Even if our EuTiO3 ceramics show lower permittivity than the single crystal due to a reduced density and/or small amount of secondary pyrochlore Eu2Ti2O7 phase, we confirmed a magnetic field dependence of the permittivity, also slightly smaller than in single crystal. An attempt to reveal the soft phonon dependence at 1.8 K on the magnetic field up to 13 T remained below the accuracy of our infrared reflectivity experiment.
PACS: 75.80.+q – Magnetomechanical and magnetoelectric effects, magnetostriction / 78.30.-j – Infrared and Raman spectra / 63.20.-e – Phonons in crystal lattices
© Europhysics Letters Association, 2007
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