EPR spectrum formation mechanism of the iron-doped ZnSe

0540796 - FZÚ 2021 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Lamonova, K. - Babkin, R. - Orel, S. - Pashkevich, Y. - Gidulyanov, M. - Bekirov, B. - Ivanchenko, I. - Popenko, N. - Savchenko, Dariia - Kovalenko, N.
EPR spectrum formation mechanism of the iron-doped ZnSe.
2020 IEEE Ukrainian Microwave Week (UkrMW) Proceedings. New York: IEEE, 2020, (2020), s. 849-853. ISBN 978-1-7281-7314-6.
[IEEE Ukrainian Microwave Week (UkrMW 2020). Kharkiv (UA), 21.09.2020-25.09.2020]
Grant CEP: GA MŠMT EF16_013/0001406
Grant ostatní: OP VVV - SAFMAT(XE) CZ.02.1.01/0.0/0.0/16_013/0001406
Institucionální podpora: RVO:68378271
Klíčová slova: Bridgman method * EPR spectroscopy * modified crystal field approach
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Zinc selenide doped with iron (ZnSe:Fe) has been obtained by the Bridgman method under excessive pressure of Ar. The ZnSe:Fe sample has been examined by X-band electron paramagnetic resonance (EPR) spectroscopy at T=5-300 K. The EPR spectrum consists of an unequally broadened line with g=2.088, a well-resolved line with the g=4.27, which occurs with decreasing temperature and some low-intensity lines arising at 5 K. Moreover, there are two sets of lines due to hf coupling with 55Mn nuclei, which appear as a concomitant impurity in the studied sample. The mechanism forming of the EPR spectrum was analyzed using Modified Crystal Field Theory. It was revealed that the EPR signal at g~2 is caused by the Fe3+ ions, which occupy both octahedral and tetrahedral positions and undergo an off-centering effect. The EPR line with g=4.27 as well as the low-intensity signals that evident at 5 K are caused by the transitions in the distorted tetrahedral complexes with anionic vacancies.
Trvalý link: http://hdl.handle.net/11104/0318400