Abstract
Anomalies of the linear magnetostriction caused by the interaction of energy levels of the rare-earth ion in DyPO4 in a strong magnetic field along the [100] and [110] axes are investigated both experimentally and theoretically. Smeared jumps and maxima on the magnetostriction curve γ (H) and its derivative dγ(H)/dH along the three perpendicular axes in the critical fields Hc = 140 and 200 kOe, when the lower energy levels of the Dy3+ ion converge, are discovered. Under the assumption of the adiabatic character of the magnetization process in pulsed fields, the quadrupole moments 〈O 02 〉, 〈O 22 , and 〈Pxy〉 are calculated, which give a rather accurate description of the anisotropy of the linear magnetostriction γ(H) and its dependence on temperature and magnetic field. It is discovered that a jumplike variation of the quadrupole interaction of α andγ(δ) symmetry in DyPO4 under crossover leads, according to the experiment, to the decrease of the critical field by about 20 kOe and a sharper change of the linear magnetostriction γ(H) and its derivative dγ (H)/dH in the vicinity of the crossover.
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Translated from Zhurnal Éksperimentalńoĭ i Teoreticheskoĭ Fiziki, Vol. 119, No. 4, 2001, pp. 805–815.
Original Russian Text Copyright © 2001 by Kazei, Kolmakova, Sidorenko, Snegirev.
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Kazei, Z.A., Kolmakova, N.P., Sidorenko, A.A. et al. Magnetostriction anomalies in DyPO4 Caused by Interaction of Levels. J Exp Theor Phys 92, 701–709 (2001). https://doi.org/10.1134/1.1371351
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DOI: https://doi.org/10.1134/1.1371351