The main elastic moduli and piezoelectric modulus have been measured in holmium alumoborate single crystals. The renormalization of the permittivity, piezoresponse, and sound velocities, driven by the nematic-like paramagnetic phase in the sample, is considered. A significant variability of the results is detected, which is caused, presumably, by the fact that, under the action of external fields, the motion trajectory of the nematic-like phase’s director depends on random defects of thermoelastic origin. It is shown that above 5 K, the temperature dependences of the studied parameters are well-described using holmium ion’s known ground multiplet spectrum, formed by the interaction with the crystal field. Changes in the C44-mode velocity in the sub-Kelvin temperature range are measured.

中文翻译：

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HoAl3(BO3)4的弹性、磁弹性、磁压电和磁介电特性

已在铝硼酸钬单晶中测量了主要的弹性模量和压电模量。考虑了由样品中的类向列顺磁相驱动的介电常数、压电响应和声速的重整化。检测到结果的显着可变性，这可能是由于在外部场的作用下，类向列相的运动轨迹取决于热弹性起源的随机缺陷的事实。结果表明，在 5 K 以上时，使用钬离子已知的由与晶体场相互作用形成的基多态谱可以很好地描述所研究参数的温度依赖性。测量了亚开尔文温度范围内 C44 模式速度的变化。