Figure 9
From: Sub-lattice of Jahn-Teller centers in hexaferrite crystal
Magnetic field dependence of the attenuation of the ultrasonic \({c}_{44}\) mode obtained at \(T=2\,{\rm{K}}\) (line 1), \(20\,{\rm{K}}\) (2), \(80\,{\rm{K}}\) (3), and \(145\,{\rm{K}}\) (4). The experimental geometry is \({\bf{B}}\)//\({\bf{k}}//[001]\), \({\bf{u}}\perp [001]\). The ultrasound frequency is \(\omega /2\pi =15\,{\rm{MHz}}\). The measurements were performed with sweeps from the highest positive to the negative field. Shift of the symmetry plane towards negative \(B\) values by approximately −1 T is due to the magnetic hysteresis.
