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An optical and dielectric spectroscopy study of Er.sup.3+./sup.-doped KTaO.sub.3./sub..

SYSNO ASEP	0368463
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	An optical and dielectric spectroscopy study of Er³⁺-doped KTaO₃.
Author(s)	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, ORCID}
Source Title	Physica Status Solidi B : Basic Solid State Physics. - : Wiley - ISSN 0370-1972 Roč. 248, č. 12 (2011), s. 2908-2915
Number of pages	8 s.
Language	eng - English
Country	DE - Germany
Keywords	Er³⁺ centres ; IR spectroscopy ; optical absorption photoluminescence ; potassium tantalate ; THz spectroscopy
Subject RIV	BH - Optics, Masers, Lasers
R&D Projects	GC202/09/J017 GA ČR - Czech Science Foundation (CSF)
	KAN301370701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	1M06002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
	AV0Z10100522 - FZU-D (2005-2011)
UT WOS	000298263400023
DOI	10.1002/pssb.201147080
Annotation	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.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2012

Number of the records: 1