Publication detail

Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics

KAMBA, S. NUZHNYY, D. VANĚK, P. SAVINOV, M. KNÍŽEK, K. SHEN, Z. ŠANTAVÁ, E. MACA, K. SADOWSKI, M. PETZELT, J.

Original Title

Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics

English Title

Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics

Type

journal article - other

Language

en

Original Abstract

Infrared reflectivity and time-domain terahertz transmission spectra of EuTiO3 ceramics revealed a polar optic phonon at 6-300K 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 1.8K on the magnetic field up to 13T remained below the accuracy of our infrared reflectivity experiment.

English abstract

Infrared reflectivity and time-domain terahertz transmission spectra of EuTiO3 ceramics revealed a polar optic phonon at 6-300K 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 1.8K on the magnetic field up to 13T remained below the accuracy of our infrared reflectivity experiment.

Keywords

Magnetomechanical and magnetoelectric effects, Magnetostriction, Infrared and Raman spectra, Phonons in crystal lattices

RIV year

2007

Released

01.10.2007

Publisher

EDP SCIENCES S A

Location

17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE

ISBN

0295-5075

Periodical

EUROPHYSICS LETTERS

Year of study

80

Number

2

State

GB

Pages from

27002-p1

Pages to

27002-p6

Pages count

6

Documents

BibTex


@article{BUT44791,
  author="Stanislav {Kamba} and Dimitry {Nuzhnyy} and Přemysl {Vaněk} and Maxim {Savinov} and Karel {Knížek} and Zhijian {Shen} and Eva {Šantavá} and Karel {Maca} and Marcin {Sadowski} and Jan {Petzelt}",
  title="Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics",
  annote="Infrared reflectivity and time-domain terahertz transmission spectra of EuTiO3
ceramics revealed a polar optic phonon at 6-300K 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 1.8K on
the magnetic field up to 13T remained below the accuracy of our infrared reflectivity experiment.",
  address="EDP SCIENCES S A",
  chapter="44791",
  institution="EDP SCIENCES S A",
  journal="EUROPHYSICS LETTERS",
  number="2",
  volume="80",
  year="2007",
  month="october",
  pages="27002-p1--27002-p6",
  publisher="EDP SCIENCES S A",
  type="journal article - other"
}