Computational identification of Ga-vacancy related electron paramagnetic resonance centers in betta-Ga2O3статья
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Дата последнего поиска статьи во внешних источниках: 24 января 2020 г.
Авторы:Skachkov D.,
Lambrecht W.,
von_Bardeleben H.J.,
Gerstmann U.,
Ho Q.D.,
Déak,
P
Аннотация:A combined experimental/theoretical study of the electron paramagnetic resonance (EPR) centers in irradiated β-Ga2O3 is presented. Four EPR spectra, two S = 1/2 and two S = 1, are observed after high-energy proton or electron irradiation. Three of them have been reported before in neutron irradiated samples. One of the S = 1/2 spectra (EPR1) can be observed at room temperature and below and is characterized by the spin Hamiltonian parameters gb = 2.0313, gc = 2.0079, and ga* = 2.0025 and a quasi-isotropic hyperfine interaction with two equivalent Ga neighbors of ∼14 G on 69Ga and correspondingly ∼18 G on 71Ga in their natural abundances. The second (EPR2) is observed after photoexcitation (with a threshold of 2.8 eV) at low temperature and is characterized by gb = 2.0064, gc = 2.0464, and ga* = 2.0024 and a quasi-isotropic hyperfine interaction with two equivalent Ga …