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Certain peculiarities of EPR spectra of Tb3+ in yttrium-aluminum garnet at a frequency of 94 GHz
Asatryan G. R..
1,2, Babunts R. A. 1, Romanov N.G.1, Kramuschenko D. D. 1, Ovanesyan K. L.. 2, Petrosyan A. G. 2
1Ioffe Institute, St. Petersburg, Russia
2Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak, Armenia
2Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak, Armenia
Email: hike.asatryan@mail.ioffe.ru
Terbium-containing crystals of yttrium-aluminum garnet, apart from EPR Tb3+ ions, located in the yttrium position in regular environment, demonstrated EPR of terbium centers, the initial splitting of the non-Kramer's quasidoublet levels of which is close to 94 GHz photon energy. They are ions of terbium with antisite defects YAl near them (yttrium ions in octahedral positions of aluminum). Using magnetic field modulation, operating frequency modulation and electron spin echo, the peculiarities of the EPR spectra were studied for such centers in low magnetic fields. The EPR spectra are also found for new centers with the hyperfine structure specific for Tb3+ and low intensity (approximately 0.05 % compared to the main centers). The number of the lines and the symmetry of these centers indicate their association with Tb3+ ions, substituting for Al3+ ions in the octahedral sites of the YAG crystal lattice. Keywords: Electron paramagnetic resonance, yttrium-aluminum garnet, rare earth elements, antisite defects
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