Abstract
A comprehensive experimental and theoretical study of magnetic, magnetoelectric, thermal, and spectroscopic characteristics of HoGa3(BO3)4 gallium borate single crystals has been performed. A large magnetoelectric effect exceeding its values found in all iron and aluminum borates except HoAl3(BO3)4 has been observed. The magnetoelectric polarization of HoGa3(BO3)4 equals ΔP ba (B a ) ≈ −1020 μC/m2 at T = 5 K in a magnetic field of 9 T. The theoretical treatment based on the crystal field model for rare-earth ions provides a unified approach for the consistent interpretation of all measured characteristics. The crystal-field parameters are determined. The temperature (in the 3–300 K range) and magnetic field (up to 9 T) dependences of the magnetization, the Schottky anomaly in the temperature dependence of the specific heat, and its shift in the field B ‖ c are described. To compare the thermal properties of HoGa3(BO3)4 with those of HoAl3(BO3)4 exhibiting record values of the polarization, the specific heat of HoAl3(BO3)4 at various B values and the temperature dependence of the polarization ΔP b (T) in the applied magnetic field of 9 T have been measured.
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Original Russian Text © N.V. Volkov, I.A. Gudim, E.V. Eremin, A.I. Begunov, A.A. Demidov, K.N. Boldyrev, 2014, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 99, No. 2, pp. 72–80.
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Volkov, N.V., Gudim, I.A., Eremin, E.V. et al. Magnetization, magnetoelectric polarization, and specific heat of HoGa3(BO3)4 . Jetp Lett. 99, 67–75 (2014). https://doi.org/10.1134/S0021364014020106
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DOI: https://doi.org/10.1134/S0021364014020106