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.

Czech title

Megnetodielektrický efekt a chování optického měkkého módu v paraelektrické EuTiO3 keramice

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.

Czech abstract

Infračervená odrazivost a terahertzová transmisní spektra EuTiO3 keramiky ukázaly přítomnost polárního optického fononu v rozmezí teplot 6-300 K, jehož změkčení způsobuje nedávno pozorované kvantově paraelektrické chování. Přestože náše EuTiO3 keramika vykazuje nižší permitivitu než monokrystal kvůli nižší hustotě anebo přítomnosti malého množství sekundární pyrochlorové Eu2Ti2O7 fáze, potvrdili jsme závislost permitivity na magnetickém poli, také o něco nižší než u monokrystalu.

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 in Czech

Magnetomechanické a magnetoelektrické jevy, Magnetostrikce, Infračervené a Ramanovo spektrum, Fonony v krystalické mřížce.

Keywords in English

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

ISSN

0295-5075

Journal

EUROPHYSICS LETTERS

Volume

80

Number

2

Pages from–to

27002-p1–27002-p6

Pages count

6

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",
  journal="EUROPHYSICS LETTERS",
  year="2007",
  volume="80",
  number="2",
  month="October",
  pages="27002-p1--27002-p6",
  publisher="EDP SCIENCES S A ",
  address="17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE ",
  issn="0295-5075"
}