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Broadband EPR-spectroscopy and crystal field of Ho3+ centers in YAlO3
Russian version
Asatryan G. R.1,2, Shakurov G. S.3, Malkin B. Z.4, Batueva A. V.1, Petrosyan A. G.2
1Ioffe Institute, St. Petersburg, Russia
2Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak, Armenia
3Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, Russia
4Kazan Federal University, Kazan, Tatarstan, Russia
Email: hike.asatryan@mail.ioffe.ru
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YAlO3 : Ho (1.5 at.%) crystals were studied by the method of tunable broadband EPR spectroscopy in sub-THz-band. EPR spectra of holmium ions with the resolved hyperfine structure correspond to resonant transitions between electron-nuclear sublevels of the ground and first excited singlets of the main multiplet 5I8 of Ho3+ ions substituting Y3+ ions in two magnetically inequivalent positions, the multiplet being split in crystal field of Cs symmetry. In addition, EPR spectra of Ho3+-Ho3+ dimers are also registered, which contain the nearest holmium ions in the magnetically equivalent positions. Crystal field parameters were obtained within the framework of the exchange charge model, and calculations of Stark splittings, constants of hyperfine structure, g-factors of isolated center and dimer were performed. These calculations are compared with optical spectroscopy data reported in the literature and with the experimental results of this study. The validity of the theoretical model was verified by calculating the characteristics of the previously studied crystal YAlO3 : Tm. Keywords: electron paramagnetic resonance, yttrium orthoaluminate, rare earth elements, dimers.
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