Spin echo studies on Fe.sup.3+./sup. ions in GaN: spin-phonon relaxation and ligand hyperfine interactions

0531899 - FZÚ 2021 RIV US eng J - Článek v odborném periodiku
Azamat, Dmitry - Badalyan, A. G. - Romanov, N.G. - Savinov, Maxim - Hrabovský, M. - Jastrabík, Lubomír - Dejneka, Alexandr - Yakovlev, D.R. - Bayer, M.
Spin echo studies on Fe³⁺ ions in GaN: spin-phonon relaxation and ligand hyperfine interactions.
Applied Physics Letters. Roč. 117, č. 3 (2020), s. 1-6, č. článku 032106. ISSN 0003-6951. E-ISSN 1077-3118
Grant CEP: GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: electron spin * Q-band frequency * GaN crystals * Fe³⁺ centers
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.791, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1063/5.0007477

The electron spin echo detected inversion recovery technique at the Q-band frequency was used to characterize spin diffusion effects in spin-lattice relaxation of compensating Fe3+ impurities in n-type doped GaN crystals. It was found that the selective saturation can be achieved in the GaN:Fe3+ system due to magnetization transfer based on the spin flip-flop cross-relaxation processes. The temperature dependence of 1/T1 can be explained by direct spin-phonon processes (∼T) below 25 K and by Raman two-phonon processes (∼T9) at higher temperatures. Spin diffusion in this system is characterized by an additional cross-relaxation rate which is weakly temperature-dependent below 25 K.
Trvalý link: http://hdl.handle.net/11104/0310530