Polar phonon mixing in magnetoelectric EuTiO3.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F09%3A00331481" target="_blank" >RIV/68378271:_____/09:00331481 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Polar phonon mixing in magnetoelectric EuTiO3.

Popis výsledku v původním jazyce

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)).

Název v anglickém jazyce

Polar phonon mixing in magnetoelectric EuTiO3.

Popis výsledku anglicky

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)).

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GA202%2F09%2F0682" target="_blank" >GA202/09/0682: Dielektrická spektroskopie a mřížková dynamika magnetoelektrických multiferoik a napjatých feroelektrických tenkých vrstev</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Physical Journal B

ISSN

1434-6028

e-ISSN

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Svazek periodika

71

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

5

Strana od-do

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Kód UT WoS článku

000271029200021

EID výsledku v databázi Scopus

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