Перевод названия: Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3-?

Тип публикации: статья из журнала

Год издания: 2016

Аннотация: The GdCoO3-? perovskite is a semiconductor with the energy gap Eg ? 0.5 eV from electrical transport measurements. It reveals unusual optical absorption spectra without transparency window expected for semiconductors. Instead we have measured the narrow transmittance peak at the photon energy ?0 = 0.087 eV. To reconcile the transpoПоказать полностьюrt and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO3-?. We have found that oxygen vacancies result in the in-gap states inside the chargetransfer energy gap of the GdCoO3. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO3-?. These in-gap states decrease the transparency window and result in a narrow absorption minimum. Predicted temperature dependence of the absorption spectra has been confirmed by our measurements.

Журнал: Письма в Журнал экспериментальной и теоретической физики

Выпуск журнала: Т. 103, № 3-4

Номера страниц: 177-183

ISSN журнала: 0370274X

Место издания: Москва

Издатель: Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука"

• Ovchinnikov S.G. (Kirensky Institute of Physics SB of the RAS; Siberian Federal University)
• Orlov Yu.S. (Kirensky Institute of Physics SB of the RAS; Siberian Federal University)
• Kuzubov A.A. (Kirensky Institute of Physics SB of the RAS)
• Dudnikov V.A. (Kirensky Institute of Physics SB of the RAS)
• Sokolov A.E. (Kirensky Institute of Physics SB of the RAS)
• Zabluda V.N. (Kirensky Institute of Physics SB of the RAS)
• Naumov S.B. (Siberian State Technological University)
• Shestakov N.P. (Kirensky Institute of Physics SB of the RAS)

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