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Эта публикация цитируется в 2 научных статьях (всего в 2 статьях)
ОПТИКА, ЛАЗЕРНАЯ ФИЗИКА
Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO$_{3-\delta}$
S. G. Ovchinnikovab, Yu. S. Orlovab, A. A. Kuzubovb, V. A. Dudnikovb, A. E. Sokolovb, V. N. Zabludab, S. B. Naumovc, N. P. Shestakovb a Siberian Federal University, 660041 Krasnoyarsk, Russia
b Kirensky Institute of Physics SB of the RAS, 660036 Krasnoyarsk, Russia
c Siberian State Technological University, 660049 Krasnoyarsk, Russia
Аннотация:
The GdCoO$_{3-\delta}$ perovskite is a semiconductor with the energy gap $E_g \approx 0.5$ 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 ${\varepsilon_0} = 0.087$ eV. To reconcile the transport and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO$_{3-\delta}$. We have found that oxygen vacancies result in the in-gap states inside the charge- transfer energy gap of the GdCoO$_3$. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO$_{3-\delta}$. 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.
Поступила в редакцию: 23.11.2015
Образец цитирования:
S. G. Ovchinnikov, Yu. S. Orlov, A. A. Kuzubov, V. A. Dudnikov, A. E. Sokolov, V. N. Zabluda, S. B. Naumov, N. P. Shestakov, “Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO$_{3-\delta}$”, Письма в ЖЭТФ, 103:3 (2016), 177–183; JETP Letters, 103:3 (2016), 161–166
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl4852 https://www.mathnet.ru/rus/jetpl/v103/i3/p177
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