The negative thermo-optic effect in KTa03 : an ellipsometry study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00450616" target="_blank" >RIV/68378271:_____/15:00450616 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1080/01411594.2014.996757" target="_blank" >http://dx.doi.org/10.1080/01411594.2014.996757</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/01411594.2014.996757" target="_blank" >10.1080/01411594.2014.996757</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The negative thermo-optic effect in KTa03 : an ellipsometry study

Popis výsledku v původním jazyce

We used optical ellipsometry to study and elucidate the nature of the negative thermo­-optic effect in KTa03 single crystals, which consists of an increasing refraction index magnitude in the visible region upon cooling (dn/dT < O). The optical constantfunctions were determined within the 1-6 eV region. The energies of the band edge indirect and direct optical transitions and their temperature evolutions in the region of 80-300 K were carefully investigated. The absorption edge in the region of the lowest indirect R ? optical transitions, 3.7-4.2 eV, was observed to shift to higher energies upon cooling. Simultaneously, an increase and "red shift" of the optical absorption in the region of the direct transitions (4.3-4.8 eV) were observed, which should be responsible for the nature of the observed negative thermo­-oplics in KTa03.

Název v anglickém jazyce

The negative thermo-optic effect in KTa03 : an ellipsometry study

Popis výsledku anglicky

We used optical ellipsometry to study and elucidate the nature of the negative thermo­-optic effect in KTa03 single crystals, which consists of an increasing refraction index magnitude in the visible region upon cooling (dn/dT < O). The optical constantfunctions were determined within the 1-6 eV region. The energies of the band edge indirect and direct optical transitions and their temperature evolutions in the region of 80-300 K were carefully investigated. The absorption edge in the region of the lowest indirect R ? optical transitions, 3.7-4.2 eV, was observed to shift to higher energies upon cooling. Simultaneously, an increase and "red shift" of the optical absorption in the region of the direct transitions (4.3-4.8 eV) were observed, which should be responsible for the nature of the observed negative thermo­-oplics in KTa03.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Phase Transitions

ISSN

0141-1594

e-ISSN

—

Svazek periodika

88

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

991-1000

Kód UT WoS článku

000359838700006

EID výsledku v databázi Scopus

2-s2.0-84939269051