Physics of the Solid State
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Wideband EPR spectroscopy of Y3Al5O12 : Ho3+ crystals
Asatryan G.R.1, Shakurov G.S.2, Petrosyan AG.3, Kramushchenko D.D.1, Hovhannesyan K.L.3
1Ioffe Institute, St. Petersburg, Russia
2Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, Russia
3Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak, Armenia

EPR spectra of Ho3+ impurity ions were recorded in single crystals of yttrium aluminum garnet (Y3Al5O12) in the frequency range of 114-170 GHz, at a temperature of 4.2 K. The measurement results indicate the substitution of Ho3+ ions for Y3+ ions in the dodecahedral position with D2 local symmetry. The magnitude of the g-factor, the hyperfine structure constant, and the energy interval between the main and the first excited nondegenerate sublevels of the main multiplet 5I8 are determined. Weak satellite signals have also been registered, the origin of which is associated with the formation of antisite defects in the environment of Ho3+ paramagnetic centers. Keywords: hyperfine interaction, rare earth ions, spin Hamiltonian, non-Kramers ion.
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