Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ
- Авторы: Ovchinnikov S.G.1,2, Orlov Y.S.1,2, Kuzubov A.A.1, Dudnikov V.A.1, Sokolov A.E.1, Zabluda V.N.1, Naumov S.B.3, Shestakov N.P.1
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Учреждения:
- Kirensky Institute of Physics, Siberian Branch
- Siberian Federal University
- Siberian State Technological University
- Выпуск: Том 103, № 3 (2016)
- Страницы: 161-166
- Раздел: Optics and Laser Physics
- URL: https://ogarev-online.ru/0021-3640/article/view/159006
- DOI: https://doi.org/10.1134/S0021364016030115
- ID: 159006
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Аннотация
The GdCoO3–δ 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 ε0 = 0.087 eV. To reconcile the transport and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO3–δ. We have found that oxygen vacancies result in the in-gap states inside the charge-transfer energy gap of the GdCoO3. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO3–δ. These in-gap states decrease the transparency window and result in a narrow absorption minimum. The predicted temperature dependence of the absorption spectra has been confirmed by our measurements.
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Об авторах
S. Ovchinnikov
Kirensky Institute of Physics, Siberian Branch; Siberian Federal University
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036; Krasnoyarsk, 660041
Yu. Orlov
Kirensky Institute of Physics, Siberian Branch; Siberian Federal University
Автор, ответственный за переписку.
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036; Krasnoyarsk, 660041
A. Kuzubov
Kirensky Institute of Physics, Siberian Branch
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036
V. Dudnikov
Kirensky Institute of Physics, Siberian Branch
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036
A. Sokolov
Kirensky Institute of Physics, Siberian Branch
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036
V. Zabluda
Kirensky Institute of Physics, Siberian Branch
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036
S. Naumov
Siberian State Technological University
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660049
N. Shestakov
Kirensky Institute of Physics, Siberian Branch
Email: jso.krasn@mail.ru
Россия, Krasnoyarsk, 660036
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