Abstract
The report presents the results of studying the temperature dependences of the velocities of propagation of longitudinal and torsion waves and the internal friction in a tetragonal FeGe2 single crystal along crystallographic axes [100], [110], and [001]. At temperatures of magnetic phase transitions of T1 ≈ 263 K and T2 ≈ 289 K an abrupt decrease of sound velocities is detected. A high anisotropy of the internal friction is observed in the region of existence of an incommensurate magnetic structure (T1 ≤ T ≤ T2).
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ACKNOWLEDGMENTS
The authors are grateful to E.V. Ustelemova for assistance in the measurements.
Funding
This work was performed in the framework of state task of the Ministry of Education and Science of the Russian Federation (theme “Spin” no. AAAA-A18-118020290104-2.
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Translated by Yu. Ryzhkov
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Zainullina, R.I., Milyaev, M.A. Elastic Properties of a FeGe2 Single Crystal. Phys. Solid State 61, 1278–1283 (2019). https://doi.org/10.1134/S1063783419070321
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DOI: https://doi.org/10.1134/S1063783419070321