G. S. Shakurov, R. I. Khaibullin, V. G. Tomas, D. A. Fursenko, R. I. Mashkovtsev, O. N. Lopatin, A. G. Nikolaev, B. P. Gorshunov, E. S. Zhukova, “Submillimeter ESR spectra of Fe<nobr>$^{2+}$</nobr> ions in synthetic and natural beryl crystals”, Fizika Tverdogo Tela, 2017, Volume 59, Issue 8,Pages <nobr>1576

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Impurity centers

Submillimeter ESR spectra of Fe$^{2+}$ ions in synthetic and natural beryl crystals

G. S. Shakurov^a, R. I. Khaibullin^a, V. G. Tomas^b, D. A. Fursenko^b, R. I. Mashkovtsev^b, O. N. Lopatin^c, A. G. Nikolaev^c, B. P. Gorshunov^de, E. S. Zhukova^de

^a Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences
^b Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^c Kazan (Volga Region) Federal University
^d Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^e Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region

Abstract: Electron spin resonance spectra of non-Kramers bivalent iron (Fe$^{2+}$) ions have been detected in synthetic and natural beryl crystals with an iron impurity. The observed ESR spectra have been attributed to resonance transitions of Fe$^{2+}$ ions from the ground (singlet) state to excited (doublet) levels with the splitting $\Delta$ = 12.7 cm$^{-1}$ between the levels. The experimental angular and frequency dependences of the resonance field of the ESR signal have been described by the spin Hamiltonian with the effective spin $S$ = 1. The analysis of the ESR data and optical absorption spectra indicates that the Fe$^{2+}$ ions are situated in tetrahedral positions and substitute Be$^{2+}$ cations in the beryl structure.

Received: 14.02.2017

DOI: 10.21883/FTT.2017.08.44761.37