Abstract
The influence of cation substitution on the Curie temperature and the magnetocapacitance in the doped magnetic relaxor ferroelectrics CdCr2S4 is investigated within the framework of the spherical random-bond-random-field model for the relaxor ferroelectric sublattice and the Heisenberg model for the magnetic sublattice. The site-dilution model is also introduced to describe the doping effect. A-site substitution of the Cd by Fe in Cd1−xFexCr2S4 is found to increase significantly the value of the Curie temperature, which well agrees with the experimental results. Additionally, the doping Fe ions play a crucial role in the fluctuation of spin-pair correlation and magnetocapacitive response.
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