Počet záznamů: 1
THz and infrared studies of multiferroic hexagonal Y.sub.1-x./sub.Eu.sub.x./sub.MnO.sub.3./sub. (x = 0 - 0.2) ceramics
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SYSNO ASEP 0353097 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název THz and infrared studies of multiferroic hexagonal Y1-xEuxMnO3 (x = 0 - 0.2) ceramics Tvůrce(i) Goian, Veronica (FZU-D) RID, ORCID
Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Kadlec, Christelle (FZU-D) RID, ORCID
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Kužel, Petr (FZU-D) RID, ORCID, SAI
Moreira, J.A. (PT)
Almeida, A. (PT)
Tavares, P.B. (PT)Zdroj.dok. Phase Transitions. - : Taylor & Francis - ISSN 0141-1594
Roč. 83, 10-11 (2010), s. 931-941Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova multiferroics ; infrared and THz 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 000284539500019 DOI 10.1080/01411594.2010.509603 Anotace We report an investigation of hexagonal Y1-xEuxMnO3 ceramics with x=0, 0.1 and 0.2 using infrared and THz spectroscopies in the temperature range between 5 and 900 K. The temperature dependence of the THz permittivity reveals a kink near the antiferromagnetic phase transition temperature TN 70 K giving evidence of a strong spin-lattice coupling. Below TN two absorption peaks were revealed in the THz spectra close to 43 and 73 cm-1. While the first peak corresponds to a sharp antiferromagnetic resonance exhibiting softening on heating towards TN, the second one may be attributed to an impurity mode or a multiphonon absorption peak. High-temperature THz spectra measured up to 900 K reveal only small gradual increase of the permittivity in agreement with a weak phonon softening observed in the infrared reflectance spectra upon heating. This corresponds to an improper ferroelectric character of the phase transition proposed from first principle calculations by Fennie and Rabe. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2011
Počet záznamů: 1