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|Title:||Donor DBH excitons and magnetism of Mn doped ZnO|
|Authors:||Sokolov, V. I.|
Gruzdev, N. B.
Vazhenin, V. A.
Fokin, A. V.
Korolev, A. V.
Menshenin, V. V.
Surikov, V. T.
Yemelchenko, G. A.
|Publisher:||Institute of Physics Publishing|
|Citation:||Donor DBH excitons and magnetism of Mn doped ZnO / V. I. Sokolov, N. B. Gruzdev, V. A. Vazhenin, A. V. Fokin, et al.. — DOI 10.1088/1742-6596/1389/1/012078 // Journal of Physics: Conference Series. — 2019. — Vol. 1. — Iss. 1389. — 12078.|
|Abstract:||In this paper the results of the study of optical absorption, photo-EPR signals and magnetic measurements of hydrothermal single crystals of zinc oxide doped with manganese were presented. Several lines were detected in optical absorption spectra at the temperature of 4.2 K and 77.3 K for σ- and π- polarizations of light in a 1.72-2.3 eV spectral range. These lines are attributed to a donor exciton [(d5 + h)e] that emerges as a result of the Coulomb binding of a free s electron and a hole, which is localized on p-d hybridized states. Properties of these lines are significantly different from the properties of lines of donor and acceptor excitons in II-VI:3d compounds. In EPR-spectra of Zn1-xMnxO crystals the intensity of allowed and forbidden EPR-signals of Mn2+ (d 5)-ions does not change under the illumination while the intensity of EPR-signals of unintentional Fe3+ (d 5)-ions decreases by 70 %. The value of the magnetic susceptibility of Zn1-xMnxO (x = 0.0009) is in linear dependence with temperature, which agrees with the Curie equation. Temperature dependence of the inverse value of the Mn2+ magnetic susceptibility indicates that the exchange interaction in ZnO:Mn crystals is absent. New experimental results allow us to assume that investigated Zn1-xMnxO (x = 0.0009) samples are semiconductors in the forbidden gap of which the donor level of d5/d4 does not exist. The hybridization of d5 states of Mn2+ and p states of the nearest four oxygen ions O2- leads to pushing out the antibonding DBH-states (d 5 + p) into the forbidden gap. The transitions of electrons from DBH-states to the conduction band provide a broad band of the impurity absorption in ZnO:Mn. Below this band we observed a, b, c and d lines, which are called dbh-donor excitons [(d5+h)e]. © Published under licence by IOP Publishing Ltd.|
ELECTRON SPIN RESONANCE SPECTROSCOPY
SEMICONDUCTING ZINC COMPOUNDS
WIDE BAND GAP SEMICONDUCTORS
DONOR AND ACCEPTOR
SEMICONDUCTING MANGANESE COMPOUNDS
|metadata.dc.description.sponsorship:||Russian Academy of Medical Sciences, RAMS: 18-10-2-6.|
Ministry of Education and Science of the Russian Federation, Minobrnauka
The research was carried out within the state assignment of Minobrnauki of Russia (theme “Magnet” No.АААА-А18-118020290129-5, theme “Electron” No. АААА-А18-118020190098-5) and within the state assignment no. 3.6115.2017/8.9 of the Ministry of Education and Science of the Russian Federation for the Ural Federal University, with the support of the grant of Ural branch of Russian Academy of Science № 18-10-2-6.
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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