Abstract
Paramagnetic centers formed by impurity Yb3+ ions in synthetic forsterite (Mg2SiO4) grown by the Czochralski technique are studied by X-band CW and pulsed EPR spectroscopy. These centers are single ions substituting magnesium in two different crystallographic positions denoted М1 and М2, and dimer associates formed by two Yb3+ ions in nearby positions М1. It is established that there is a pronounced mechanism favoring self-organization of ytterbium ions in dimer associates during the crystal growth, and the mechanism of the spin–spin coupling between ytterbium ions in the associate has predominantly a dipole–dipole character, which makes it possible to control the energy of the spin–spin interaction by changing the orientation of the external magnetic field. The structural computer simulation of cluster ytterbium centers in forsterite crystals is carried out by the method of interatomic potentials using the GULP 4.0.1 code (General Utility Lattice Program). It is established that the formation of dimer associates in the form of a chain parallel to the crystallographic axis consisting of two ytterbium ions with a magnesium vacancy between them is the most energetically favorable for ytterbium ions substituting magnesium in the position М1.
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Original Russian Text © V.F. Tarasov, A.A. Sukhanov, V.B. Dudnikova, E.V. Zharikov, D.A. Lis, K.A. Subbotin, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 106, No. 2, pp. 78–83.
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Tarasov, V.F., Sukhanov, A.A., Dudnikova, V.B. et al. Dimer self-organization of impurity ytterbium ions in synthetic forsterite single crystals. Jetp Lett. 106, 92–96 (2017). https://doi.org/10.1134/S0021364017140132
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DOI: https://doi.org/10.1134/S0021364017140132