Počet záznamů: 1

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

SYSNO ASEP	0331481
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Polar phonon mixing in magnetoelectric EuTiO₃.
Překlad názvu	Míchání polárních fononů v magnetoelektrickém EuTiO₃.
Tvůrce(i)	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}
Zdroj.dok.	European Physical Journal B. - : Springer - ISSN 1434-6028 Roč. 71, č. 3 (2009), 429-433
Poč.str.	5 s.
Jazyk dok.	eng - angličtina
Země vyd.	DE - Německo
Klíč. slova	multiferroics ; infrared spectroscopy ; phonons
Vědní obor RIV	BM - Fyzika pevných látek a magnetismus
CEP	GA202/09/0682 GA ČR - Grantová agentura ČR
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000271029200021
DOI	10.1140/epjb/e2009-00205-5
Anotace	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)).
Pracoviště	Fyzikální ústav
Kontakt	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Rok sběru	2010

Počet záznamů: 1