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Low-temperature NIR-VUV optical constants of (001) LaAlO.sub.3./sub. crystal
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SYSNO ASEP 0560878 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Low-temperature NIR-VUV optical constants of (001) LaAlO3 crystal Author(s) Nepomniashchaia, Natalia (FZU-D) ORCID
Vetokhina, Volha (FZU-D) ORCID
Chvostová, Dagmar (FZU-D) RID, SAI, ORCID
Bryknar, Z. (CZ)
Dejneka, Alexandr (FZU-D) RID, ORCID
Tyunina, Marina (FZU-D) ORCIDNumber of authors 6 Source Title Optical Materials Express. - : Optical Society of America - ISSN 2159-3930
Roč. 12, č. 8 (2022), s. 3081-3089Number of pages 9 s. Language eng - English Country US - United States Keywords low-temperature ; ellipsometry ; optical constants ; LaAlO3 crystal Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000899595700002 EID SCOPUS 85135395755 DOI 10.1364/OME.461098 Annotation The optical constants and dielectric function of (001) LaAlO3 crystal were investigated at low temperatures down to 10 K in the NIR-VUV spectral range (photon energies 0.8-8.8 eV). Reflection variable angle spectroscopic ellipsometry and transmission spectroscopy were applied. Interband transitions were examined using the Tauc plots and the critical-point analysis. At room temperature, the indirect bandgap of 5.6 ± 0.01 eV and the lowest-energy direct transition at 7.2 ± 0.03 eV were detected. On cooling to 10 K, a blueshift of ∼0.2 eV and ∼0.1 eV was observed for the indirect and direct transitions, respectively. In the transparency spectral range, the index of refraction was found to be nearly temperature-independent and vary with photon energy from 2.0 (1 eV) to 2.5 (5.5 eV). It was suggested that the excellent thermal stability of the index of refraction may be related to the revealed thermally stable interband transitions.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333658
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