Počet záznamů: 1
An optical and dielectric spectroscopy study of Er.sup.3+./sup.-doped KTaO.sub.3./sub..
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SYSNO ASEP 0368463 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název An optical and dielectric spectroscopy study of Er3+-doped KTaO3. Tvůrce(i) Trepakov, Vladimír (FZU-D) RID
Skvortsov, A. (RU)
Poletaev, N. (RU)
Potůček, Zdeněk (FZU-D) RID, ORCID
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Jastrabík, Lubomír (FZU-D) RID, ORCID
Dejneka, Alexandr (FZU-D) RID, ORCIDZdroj.dok. Physica Status Solidi B : Basic Solid State Physics. - : Wiley - ISSN 0370-1972
Roč. 248, č. 12 (2011), s. 2908-2915Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Er3+ centres ; IR spectroscopy ; optical absorption photoluminescence ; potassium tantalate ; THz spectroscopy Vědní obor RIV BH - Optika, masery a lasery CEP GC202/09/J017 GA ČR - Grantová agentura ČR KAN301370701 GA AV ČR - Akademie věd 1M06002 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z10100520 - FZU-D (2005-2011) AV0Z10100522 - FZU-D (2005-2011) UT WOS 000298263400023 DOI 10.1002/pssb.201147080 Anotace We report the results of a multifaceted study of optical and dielectric properties of erbium-doped potassium tantalate crystals. Studies of optical absorption and photoluminescence allowed us to determine the system of energy levels that control the main internal optical transitions in the 4f electronic shell of Er3+ in KTaO3. It was found that at least two types of Er-centres,major and minor ones, are present. The major centres are noncubic,formed by Er3+ substituting for K+ sites; these are responsible for the n-type conductivity of crystals. Wideband optical absorption with a maximum at 1.13 eV was attributed to polaron formation.Far-IR reflectivity studies revealed an increase in the frequency of the lowest transverse optical mode and a decrease in the dielectric permittivity in comparison with undoped crystals. This stiffening means the suppression of the ferroelectric instability in the system. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
Počet záznamů: 1