High-temperature magnetoelectricity of terbium aluminum borate: The role of excited states of the rare-earth ion

IR spectroscopy of the low-frequency phonon spectrum of the TbFe3(BO3)4 single-crystal

“…This splitting of the ground multiplet of the Tb 3þ ion, with similar electron level energies, is observed in isostructural alyumoborate TbAl 3 (BO 3 ) 4 . 26,27 Comparison with Raman data As seen in Tables 3 and 4, for the high temperature phase of the TbFe 3 (BO 3 ) 4 crystal, the data on the frequency of vibrational modes from this study, and the Raman results, 5 coincide fairly well. In the region of the spectrum up to 400 cm À1 , where adjacent modes have a large separation of frequencies (in comparison to their LO-TO split), the match-up is almost complete for both E-and A 2 -modes, which are observable in the Raman spectrum thanks to the Pockels effect.…”

Magnetoelectric and magnetic properties of aluminum borates Ho1 − x Nd x Al3(BO3)4

“…The anomalous temperature dependence of the polarization was found in TbAl 3 (BO 3 ) 4 . It is asso ciated with the population of the upper energy levels of the ground multiplet of the Tb 3+ ion increasing with the temperature [6]. However, no complete under standing of the mechanisms of the magnetoelectric interaction in aluminum borates and the role of the R ion in the occurring processes is achieved yet.…”

“…It was estab lished that borates with two magnetic subsystems (iron borates RFe 3 (BO 3 ) 4 ) belong to multiferroics [1,3,7]. It has been established recently that aluminum borates RAl 3 (BO 3 ) 4 known for their nonlinear optical proper ties, which are borates with one magnetic subsystem, demonstrate colossal magnetoelectric polarization [6,[8][9][10][11]. In HoAl 3 (BO 3 ) 4 , the magnetoelectric polariza tion record high for multiferroics at T = 5 K in a field of 9 T is ΔP ab (B b ) ≈ -5240 μC/m 2 [11] and is several times higher than the known maximum polarization values, including those in iron borates.…”

“…Trigonal rare earth borates RM 3 (BO 3 ) 4 (M = Fe, Al, Cr, Ga, Sc) have been intensely studied in the last decade owing to their interesting physical properties and their variety at different combinations of R and M elements (see, e.g., [1][2][3][4][5][6] and review [7]). It was estab lished that borates with two magnetic subsystems (iron borates RFe 3 (BO 3 ) 4 ) belong to multiferroics [1,3,7].…”

Spectroscopy of f−f transitions, crystal-field calculations, and magnetic and quadrupole helix chirality in DyFe3(BПопова1, Чукалина2, Болдырев3 et al. 2017Phys. Rev. BSelf Cite9000View full textAdd to dashboardCite

“…The most known representatives of this family are aluminum borates, which are used in selffrequency doubling and self-frequency summing lasers (see, e.g., Refs [5][6][7] and references therein). Additional interest of scientists in the huntite borates is connected with an appreciable magnetoelectric effect found in the yttrium and rare-earth (RE) iron borates (see, e.g., Refs [8][9][10][11] and references therein) and in the RE aluminum and gallium borates [12][13][14][15].…”