Magnetostriction and thermal expansion of HoAl3(BO3)4 |
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Authors: | A. I. Begunov D. V. Volkov A. A. Demidov |
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Affiliation: | 1. Bryansk State Technical University, bul’v. Pyatidesyatiletiya Oktyabrya 7, Bryansk, 241035, Russia 2. Moscow State University, Moscow, 119991, Russia
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Abstract: | The magnetostriction and thermal expansion of rare-earth aluminoborate HoAl3(BO3)4 have been studied theoretically. The calculated field and temperature dependences of the multipole moments of the Ho3+ ion in HoAl3(BO3)4 made it possible to describe the known experimental data and to predict possible anomalies of thermal expansion. It has been shown that, for the direction of the field B ‖ c, the nonmonotonic character of magnetostriction along the axis a is determined by the multipole moments, the main of which is β J 〈O 4 0 〉. For B ‖ a and B ‖ b, the maximum moments are β J 〈O 4 2 〉and α J 〈O 2 2 〉; their variation with the field and temperature explain well the form of magnetostriction. It has been established that the greater value of magnetostriction Δa/a for B ‖ b than for B ‖ a and the greater value of magnetostriction for the field in the basal plane than for B ‖ c are caused by greater variations in the field of actual multipole moments. |
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