Magnetic, dielectric and optical properties of Al-, Mg-, Co- and Zn-ion–doped CuCrO2

Abstract

The effects of Al, Mg, Co and Zn ion doping on different properties of multiferroic CuCrO2 are studied using a microscopic model and the Green's function technique. The temperature dependence of the dielectric constant shows a kink near T N . For Al ion doping decreases, for Co it increases, whereas for Mg it has a maximum for . decreases with increasing magnetic field h ab . The magnetization M is reduced with enhancing the Al and Zn doping concentration, whereas by Mg doping M shows a maximum at . The band gap E g increases weakly for Zn doping. It decreases strongly with increasing Co and slightly with increasing Mg doping, which is in good quantitative agreement with the experimental data.