Events

Seminar of International Laboratory of High Magnetic Fields and Low Temperatures PAS

Magnetoelectric effect and magnetostriction in the paramagnetic and antiferromagnetic piezoelectrics

Alexander I. Kharkovskiy

Institute of High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russia

Magnetoelectric effect, magnetostriction, and the magnetic moment in piezoelectric paramagnetic NiSO₄⋅6H₂O and CeCuCl₃ (in a paramagnetic and  in an antiferromagnetic state) is comprehensively studied over a wide temperature range in a magnetic fields up to 14 T for several magnetic field directions with respect to the crystallographic axes.

In order to explain the magnetoelectric effect, simple contribution of the magnetostriction induced piezoelectric effect is considered. It is shown that the piezoelectric effect may be neglected in the case of the NiSO₄⋅6H₂O single crystal, especially at the liquid Helium temperature, where the magnetoelectric effect is large. However, in the case of CeCuCl₃ the relative contribution of the piezoelectric effect is comparable with the observed magnetoelectric effect but has an opposite sign. As a consequence, magnetoelectric effect change the sign around temperature of 50K.