Abstract
The effect of the coupling between the spin (magnetic), electric, and elastic subsystems of the biaxial paramagnetic crystal has been studied. Relative changes of the electric permittivity, piezoelectric modules, elastic modules, and the magnetic susceptibility of such a system have been calculated. It has been shown that the external electric field, polarized in the plane, perpendicular to the external magnetic field, depending on its polarization, can change the effective symmetry of the crystal, reducing it to the monoclinic symmetry, or enlarging it to the tetragonal (with one distinguished axis) one. Those changes of the symmetry manifest themselves in the special features in the behavior of various calculated characteristics of the paramagnetic crystal with coupled magnetic, electric, and elastic subsystems.
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