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Vibrational modes and overlap matrix of LiNb.sub.1-x./sub.Ta.sub.x./sub.O.sub.3./sub. mixed crystals
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SYSNO ASEP 0504703 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Vibrational modes and overlap matrix of LiNb1-xTaxO3 mixed crystals Tvůrce(i) Bartasyte, A. (GB)
Margueron, S. (FR)
Glazer, A.M. (GB)
Simon, E. (IN)
Gregora, Ivan (FZU-D) RID, ORCID
Huband, S. (GB)
Thomas, P.A. (GB)Celkový počet autorů 7 Číslo článku 094306 Zdroj.dok. Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 99, č. 9 (2019), s. 1-13Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova mixed crystals ; IR and Raman spectroscopy ; lattice vibrations Vědní obor RIV BM - Fyzika pevných látek a magnetismus Obor OECD Condensed matter physics (including formerly solid state physics, supercond.) Způsob publikování Omezený přístup Institucionální podpora FZU-D - RVO:68378271 UT WOS 000461052000001 EID SCOPUS 85063142852 DOI 10.1103/PhysRevB.99.094306 Anotace The wave numbers and strengths of the lattice vibrational modes of LiNbO3-LiTaO3 solid solutions have been studied by Raman and IR spectroscopy. The substitution of Nb by Ta induces shifts of wave numbers and intensities of phonon modes indicating a one-phonon behavior. The wave numbers of low-frequency vibrations soften with the increased atomic mass. The frequencies of most of the high-frequency modes increase with the Ta/Nb ratio. A qualitative relation between the shift of transverse and longitudinal modes in the solid solutions has been found on the basis of an overlap matrix. The exceptional softening of several high-frequency modes with the replacement of Nb by Ta originates from strong interaction of these modes with modes at low frequencies according to the overlap matrix. The intensities of the Raman modes are strongly modulated by the electronic properties with Ta/Nb substitution and this explains their role in the physical properties of LiNbO3 and LiTaO3. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2020 Elektronická adresa https://doi.org/10.1103/physrevb.99.094306
Počet záznamů: 1