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Spectroscopic ellipsometry of SrTiO.sub.3./sub. crystals applied to antiferrodistortive surface phase transition
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SYSNO ASEP 0347971 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Spectroscopic ellipsometry of SrTiO3 crystals applied to antiferrodistortive surface phase transition Tvůrce(i) Dejneka, Alexandr (FZU-D) RID, ORCID
Trepakov, Vladimír (FZU-D) RID
Jastrabík, Lubomír (FZU-D) RID, ORCIDZdroj.dok. Physica Status Solidi B : Basic Solid State Physics. - : Wiley - ISSN 0370-1972
Roč. 247, č. 8 (2010), s. 1951-1955Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova ellipsometry ; optical properties ; phase transitions ; surfaces and interfaces Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GC202/09/J017 GA ČR - Grantová agentura ČR GA202/08/1009 GA ČR - Grantová agentura ČR KAN301370701 GA AV ČR - Akademie věd 1M06002 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z10100522 - FZU-D (2005-2011) UT WOS 000281092600018 DOI 10.1002/pssb.200983943 Anotace This work is devoted to the ellipsometric study of antiferrodistortive cubic-to-tetragonal phase transition (PT) of SrTiO3 surface. Strong influence of surface defect structure on magnitude and temperature evolutions of surface refractive index related to PT was found and investigated. It is shown that even small surface imperfections result in enhancement and strong changes of the surface refractive index when approaching the temperature of PT. This effect is caused by emergence and evolutions in the surface of the structural changes corresponding to order parameter at the temperatures sufficiently higher than transition temperature in the bulk. In the case of structurally perfect crystal surface, the features of the temperature dependence of surface refractive index appeared to be very small and visible at the temperatures a little smaller than transition temperature for bulk that agrees well with predictions of Kaganov–Omel’yanchuk theory. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2011
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