Fizika Nizkikh Temperatur: Volume 46, Number 9 (September 2020), p. 1092-1101 ( to contents , go back )
Elastic, magnetoelastic, magnetopiezoelectric, and magnetodielectric characteristics of the HoAl3(BO3)4
I. V. Bilych, M. P. Kolodyazhnaya, K. R. Zhekov, G. A. Zvyagina, V. D. Fil
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
I. A. Gudim
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Received April 9, 2020, published online July 22, 2020
The main elastic module and the piezoelectric module for holmium alumoborate single crystals were measured. The renormalizations of the permittivity, piezoelectric response, and sound velocities caused by the development of a nematic-like paramagnetic phase in the sample were studied. Significant variability (irreproducibility) of the results was also discovered, which appears, presumably, due to the dependence of the trajectory of motion the director of the nematic-like phase under the influence of external fields on random defects of thermoelastic origin. It was shown that the temperature dependencies of the studied parameters at T >5 K are well described using the well-known spectrum of the main multiplet of holmium ions, formed by the interaction with the crystal field. Changes in the C44-mode velocity were measured in the sub-Kelvin temperature range.
Key words: magnetoelectric effects, piezoelectric effects, magnetoelastic effects, multiferroics.