EPR Spectroscopy of $$^{53}\hbox {Cr}^{3+}$$ 53
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Applied Magnetic Resonance
ORIGINAL PAPER
EPR Spectroscopy of 53 Cr3+ Monoisotopic Impurity Ions in a Single Crystal of Scandium Orthosilicate Sc2 SiO5 V. F. Tarasov1 · R. M. Eremina1,2 · K. B. Konov1 · R. F. Likerov1 · A. V. Shestakov1 · Yu. D. Zavartsev3 · S. A. Kutovoi3 Received: 22 May 2020 / Revised: 1 July 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Monoisotopic 53 Cr3+ impurity ions in scandium orthosilicate single crystal ( Sc2 SiO5 ) are studied by the method of electron paramagnetic resonance in the X-band frequencies. The directions of the main principal magnetic axes and the parameters of the effective spin Hamiltonian that describe the magnetic characteristics of the impurity centers of chromium, which replaces scandium in two structurally nonequivalent positions, are determined. It is shown that the orientation dependencies of the EPR spectra are well described by the second-order spin Hamiltonian corresponding to the orthorhombic symmetry of the local crystal field acting on the impurity ion. It was assumed that the g-tensor and the A-tensor determining the Zeeman energy of electronic levels in a magnetic field and the hyperfine interaction of electron and nuclear spins are isotropic, and the entire anisotropy of the EPR spectra is due to the anisotropy of the D-tensor, which describes the fine structure of electronic levels in a crystalline electric field. A strong dependence of the probability of “forbidden” transitions between hyperfine sublevels of electronic levels on the orientation of an external magnetic field is established. Moreover, for some orientations, the probability of “forbidden” transitions exceeds the probability of “allowed” transitions.
* R. F. Likerov [email protected] 1
Zavoisky Physical‑Technical Institute, Federal Research Center “Kazan Scientific Center of RAS”, Sibirsky tract, 10/7, 420029 Kazan, Russia
2
Kazan (Volga Region) Federal University, Kremlevskaya st., 18, 420008 Kazan, Russia
3
Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilova St., 38, 119991 Moscow, Russia
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V. F. Tarasov et al.
1 Introduction Dielectric crystals doped with transition metals are actively studied as promising materials for solid-state lasers and optoelectronic devices [1, 2]. High-performance solid-state lasers are based on impurity trivalent and tetravalent chromium ions in ruby and forsterite [3–5]. Therefore, the structure and possible laser properties of chromium impurity centers in various dielectric crystals are of great interest. In particular, laser generation was obtained with the use of impurity chromium ions in yttrium orthosilicate Y2 SiO5 [4, 5]. Using electron paramagnetic resonance (EPR), it was shown that chromium impurity ions enter the crystalline structure of Y2 SiO5 in the form of trivalent ions, replacing yttrium in one of two structurally different positions [6]. The magnetic characteristics of chromium impurity ions in Y2 SiO5 were determined in [7]. The properties of chromi
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