Abstract
Magnetic and magnetoelectric properties of ferroborate single crystals with complex composition (Tb1 − x Er x Fe3(BO3)4, x = 0, 0.75) and with competing exchange Tb-Fe and Er-Fe interactions are investigated. Jumps in electric polarization, magnetostriction, and magnetization are observed as a result of spin-flop transitions, as well as a considerable decrease in the critical field upon an increase in the Er concentration, in a field H c parallel to the c axis. The observed behavior of phase-transition fields is analyzed and explained using a simple model taking into account anisotropy in g factors and exchange splitting of funda-mental doublets of the easy-axis Tb3+ ion and easy-plane Er3+ ion. It is established that magnetoelectric and magnetostriction anomalies under spin-flop transitions are mainly controlled by the Tb subsystem. The Tb subsystem makes a nonmonotonic contribution ΔP a (H a , T) to polarization along the a axis: the value of ΔP a reverses its sign and increases with temperature due to the contribution from the excited states of the Tb3+ ion.
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Original Russian Text © A.K. Zvezdin, A.M. Kadomtseva, Yu.F. Popov, G.P. Vorob’ev, A.P. Pyatakov, V.Yu. Ivanov, A.M. Kuz’menko, A.A. Mukhin, L.N. Bezmaternykh, I.A. Gudim, 2009, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 136, No. 1, pp. 80–86.
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Zvezdin, A.K., Kadomtseva, A.M., Popov, Y.F. et al. Magnetic anisotropy and magnetoelectric properties of Tb1 − x Er x Fe3(BO3)4 ferroborates. J. Exp. Theor. Phys. 109, 68–73 (2009). https://doi.org/10.1134/S1063776109070097
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DOI: https://doi.org/10.1134/S1063776109070097