Experimental manifestations of the Nb4+-O- polaronic excitons in KTa0.988Nb0.012O3.
Result description
The formation of the photopolaronic excitons has been detected experimentally by means of the photoinduced EPR studies of KTa0.988Nb0.012O3 crystals.The signal is attributed to the single trapped charge carriers.The anisotropic spectrum is caused by theaxial centers oriented along the C4 axes.The anisotropic spectrum is attributed to the Nb4+-O- polaronic excitons.The temperature dependence of the anisotropic component is characterized by two activation energies: the internal dynamics activation energy(3.7 meV), which makes the EPR spectrum unobservable above 10 K, and the destruction energy (52 meV).By comparing the anisotropic photo-EPR spectrum and the photoinduced optical absorption temperature dependencies, we found that the Nb4+-O- polaronic excitons also manifested themselves via the wide absorption band at 0.7 eV arising under ultraviolet light excitation.Klíčová slova: photoinduced EPR, Nb4+-O- polaronic excitons , KTa0.988Nb0.012O3
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Experimental manifestations of the Nb4+-O- polaronic excitons in KTa0.988Nb0.012O3.
Original language description
The formation of the photopolaronic excitons has been detected experimentally by means of the photoinduced EPR studies of KTa0.988Nb0.012O3 crystals.The signal is attributed to the single trapped charge carriers.The anisotropic spectrum is caused by theaxial centers oriented along the C4 axes.The anisotropic spectrum is attributed to the Nb4+-O- polaronic excitons.The temperature dependence of the anisotropic component is characterized by two activation energies: the internal dynamics activation energy(3.7 meV), which makes the EPR spectrum unobservable above 10 K, and the destruction energy (52 meV).By comparing the anisotropic photo-EPR spectrum and the photoinduced optical absorption temperature dependencies, we found that the Nb4+-O- polaronic excitons also manifested themselves via the wide absorption band at 0.7 eV arising under ultraviolet light excitation.Klíčová slova: photoinduced EPR, Nb4+-O- polaronic excitons , KTa0.988Nb0.012O3
Czech name
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Czech description
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Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review. B
ISSN
1098-0121
e-ISSN
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Volume of the periodical
84
Issue of the periodical within the volume
17
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
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UT code for WoS article
000297294500005
EID of the result in the Scopus database
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Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Condensed matter physics (including formerly solid state physics, supercond.)
Year of implementation
2011