Kazan Zavoisky Physical Technical Institute

Kazan, Russia

Kazan Zavoisky Physical Technical Institute

Kazan, Russia
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Falin M.L.,Kazan Zavoisky Physical Technical Institute | Gerasimov K.I.,Kazan Federal University | Latypov V.A.,Kazan Zavoisky Physical Technical Institute | Leushin A.M.,Kazan Federal University | And 2 more authors.
Journal of Physics and Chemistry of Solids | Year: 2014

The paramagnetic center of tetragonal symmetry formed by the Yb3+ ion in the KZnF3 crystal has been studied using methods of EPR, ENDOR and optical spectroscopy. The location of the impurity ion and the structural model of the complex differing from the model of the Yb3+ center in KMgF3 have been established. The empirical scheme of the energy levels of the Yb3+ ion has been found. The parameters of its interaction with the crystal electrostatic field and the hyperfine interaction with ligands of the nearest environment have been determined. The parameters of the crystal field were used for the analysis of the distortions of the crystal lattice in the vicinity of Yb3+. The parameters of the transferred hyperfine interaction have been calculated for the distances between Yb3+ and F- ions of the nearest environment obtained taking into account the found distortions. They are in good agreement with the experimental values. © Published by Elsevier Ltd.


Falin M.L.,Kazan Zavoisky Physical Technical Institute | Latypov V.A.,Kazan Zavoisky Physical Technical Institute | Leushin A.M.,Kazan Federal University | Korableva S.L.,Kazan Federal University
Journal of Alloys and Compounds | Year: 2016

The EPR spectrum of the Ce3+ ion in the crystal of the elpasolite type Rb2NaYF6 has been observed and studied at low temperatures (Т = 4.2 – 80 K). It was established that the paramagnetic center Ce3+ has tetragonal symmetry confirming the experimental fact we reported recently that at low temperatures the Rb2NaYF6 crystal exists in the tetragonal phase, into which it transferred from the cubic phase as a result of the structural phase transition (PT). Parameters of the spin Hamiltonian of the tetragonal EPR spectrum were determined. A scheme of 4f energy levels of the Ce3+ ion in Rb2NaYF6 before and after PT was proposed from the theoretical interpretation of the observed g-factors and parameters of the crystal fields acting on it were determined. © 2016 Elsevier B.V.


Falin M.L.,Kazan Zavoisky Physical Technical Institute | Zaripov M.M.,Kazan Zavoisky Physical Technical Institute | Latypov V.A.,Kazan Zavoisky Physical Technical Institute
Applied Magnetic Resonance | Year: 2016

The electron paramagnetic resonance (EPR) spectrum of 24 magnetically nonequivalent Nd3+ centers has been found and studied in the perovskite-type crystal KZnF3 for the first time. The problem of attributing EPR spectra of magnetically nonequivalent centers with S = 1/2 in crystals with the cubic symmetry was solved in the general form. The parameters of the spin Hamiltonian were determined. © 2015, Springer-Verlag Wien.

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