Elastic Properties of a FeGe2 Single Crystal

Resumo

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).