Al-doping-induced magnetocapacitance in the multiferroic AgCrS₂

In this paper, multiferroics and magnetocapacitive effect of triangular-lattice antiferromagnet AgAl_0.02Cr_0.98S₂ are investigated by magnetic, ferroelectric, pyroelectric current and dielectric measurement. We find that it is a multiferroic material and the magnetocapacitive effect reaches a factor of up to 90 in an external field of 7 T. The results imply the further possibility of synthesizing the magnetocapacitive materials by modifying the frustrated spin structure in terms of a few B-site doping nonmagnetic ions.