Number of the records: 1

Polar phonon mixing in magnetoelectric EuTiO.sub.3./sub..

SYSNO ASEP	0331481
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Polar phonon mixing in magnetoelectric EuTiO₃.
Title	Míchání polárních fononů v magnetoelektrickém EuTiO₃.
Author(s)	Goian, Veronica (FZU-D)_{RID, ORCID} Kamba, Stanislav (FZU-D)_{RID, ORCID, SAI} Hlinka, Jiří (FZU-D)_{RID, ORCID} Vaněk, Přemysl (FZU-D)_{RID, ORCID} Belik, A.A. (JP) Kolodiazhnyi, T. (JP) Petzelt, Jan (FZU-D)_{RID, ORCID, SAI}
Source Title	European Physical Journal B. - : Springer - ISSN 1434-6028 Roč. 71, č. 3 (2009), 429-433
Number of pages	5 s.
Language	eng - English
Country	DE - Germany
Keywords	multiferroics ; infrared spectroscopy ; phonons
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GA202/09/0682 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000271029200021
DOI	10.1140/epjb/e2009-00205-5
Annotation	Infrared reflectivity spectra of antiferromagnetic incipient ferroelectric EuTiO3 were investigated up to 600 K. Analysis of phonon plasma frequencies showed that the lowest-energy TO1 phonon correspond predominantly to the Slater mode describing vibration of Ti cations against the oxygen octahedra. TO2 phonon expresses vibrations of Eu cation against the TiO6 octahedra and the highest frequency phonon represents O-octahedra bending. Incipient ferroelectric behavior of the permittivity is caused by pronounced softening of the TO1 phonon, which is coupled to the TO2 mode. Although the Eu cations are not involved in the TO1 mode, the spin ordering of the 4f electrons at Eu cations has influence on the frequency of TO1 mode due to its coupling with TO2 mode as the consequence of superexchange interaction. This is probably responsible for 7% change of the permittivity induced by magnetic field in antiferromagnetic phase, as rep. by Katsufuji and Takagi (Phys. Rev. B 64, 054415 (2001)).
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2010

Number of the records: 1