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

Abstract

The magnetoelectric and magnetic properties of substituted aluminum borates Ho 1 -x Nd x Al 3 (BO 3 ) 4 have been studied experimentally and theoretically. A large magnetoelectric effect exceeding all known values in isostructural compounds except for HoAl 3 (BO 3 ) 4 has been found. The magnetoelectric polarization of Ho 0.8 Nd 0.2 Al 3 (BO 3 ) 4 and Ho 0.5 Nd 0.5 Al 3 (BO 3 ) 4 at T = 5 K in a field of 9 T is ΔP ab (B b ) ≈ ⎯2630 and 1380 μC/m 2 , respectively. A theoretical consideration based on the crystal field model for the rare earth ion made it possible to interpret all measured properties within the unified approach. The crystal field parameters have been determined. The temperature (3-300 K) and field (up to 9 T) dependences of the magnetization and the temperature (5-100 K) and field (up to 9 T) dependences of the polarization have been described. The studied properties of Ho 1 -x Nd x Al 3 (BO 3 ) 4 have been compared with those of HoAl 3 (BO 3 ) 4 demonstrat ing record high polarization values.

Monoclinic SmAl3(BO3)4: synthesis, structural and spectroscopic properties

“…In the present study, single-crystal samples of SmAl 3 (BO 3 ) 4 were synthesized successfully from a flux based on bismuth and lithium molybdates (Temerov et al, 2008). As was shown previously, this method is highly efficient for the preparation of high-quality single crystals of ReAl 3 (BO 3 ) 4 with a trigonal structure (Chaudhury et al, 2010;Kadomtseva et al, 2014;Boldyrev et al, 2012;Volkov et al, 2015;Ivanov et al, 2013Ivanov et al, , 2017Denisov et al, 2014;Malakhovskii et al, 2017;Aleksandrovsky et al, 2010). However, the structure of the SmAB samples synthesized in our work using the same method is monoclinic.…”