Abstract
The structural, elastic, magnetic, and magnetoelectric properties of the CaBaCo4O7 multiferroic are experimentally studied and compared with the properties of the related YBaCo4O7 cobaltite, where Y3+ ions substitute for Ca2+ ions. Unlike the frustrated YBaCo4O7 magnet, the softening of Young’s modulus and the hysteresis in the ΔE(T)/E 0 curve of ferrimagnetic CaBaCo4O7 in the paramagnetic region are weak, and the anomaly during the magnetic transition increases by almost an order of magnitude. This difference can point to different characters of the development of a long-range magnetic order in these two cobaltites. The distortion of the crystal structure that removes the frustrations of exchange interactions is found to correlate with the magnetic behavior of the cobaltites under study. The magnetization curves of the Ca cobaltite have two steps below 15 K, which can point to the presence of a metastable state in a high magnetic field. The study of the longitudinal and transverse magnetoelectric effects in a pulsed magnetic field demonstrates that their magnitudes are maximal near T C and change their character from linear to quadratic during passage through this temperature.
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Original Russian Text © Z.A. Kazei, V.V. Snegirev, G.P. Vorob’ev, Yu.F. Popov, D.K. Vyalykh, L.P. Kozeeva, M.Yu. Kameneva, 2016, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 150, No. 6, pp. 1179–1190.
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Kazei, Z.A., Snegirev, V.V., Vorob’ev, G.P. et al. Elastic, magnetic, and magnetoelectric properties of the CaBaCo4O7 multiferroic. J. Exp. Theor. Phys. 123, 1025–1034 (2016). https://doi.org/10.1134/S106377611611011X
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DOI: https://doi.org/10.1134/S106377611611011X