A 'Soft Electronic Band' and the Negative Thermooptic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F09%3A00164927" target="_blank" >RIV/68407700:21340/09:00164927 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

A 'Soft Electronic Band' and the Negative Thermooptic

Original language description

The optical functions of strontium titanate (SrTiO3) (STO) single crystals were determined with spectroscopic ellipsometry in the 1-6 eV spectralregion and the 4.2-300K temperature region. On approaching the band gap edge, the optical absorption shows Urbach tail behavior followed by the onset of indirect optical transitions starting at 3.2 eV and extending up to 3.68 eV; then direct transitions are very well seen. The refractive index and its temperature and spectral dependences were obtained. In the visible region, the refractive index rises on cooling (negative thermooptic effect) down to 50 K, saturating at lower temperatures. The energy of indirect interband optical transitions increases on cooling up to 3.23 eV at 100 K. The observed magnitude dE/dT = -1.7 x 10-4 eVK-1 is typical of ionic crystals. Surprisingly, the absorption edge in the region of the lowest direct interband optical transitions 3.7-4 eV shifts to lower energies on cooling.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA202%2F08%2F1009" target="_blank" >GA202/08/1009: Characterization and technology of new perovskite structures</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2009

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

New Journal of Physics

ISSN

1367-2630

e-ISSN

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Volume of the periodical

11

Issue of the periodical within the volume

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Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

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UT code for WoS article

000269487500001

EID of the result in the Scopus database

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