Adiabatic Magnetooptical and Magnetocaloric Effects of Tb₃Ga₅O₁₂ at Low Temperature in Strong Magnetic Fields

In a strong magnetic field, the magnetic susceptibility χ and equivalent magnetic susceptibility λχ of some paramagnetic materials depend sensitively on the applied field H_e. Here λ is the coefficient of the effective field H_m, which relates to the superexchange interaction between the electrons in different magnetic ions. We present the forms of the adiabatic equivalent λχ and the effective field H_m. The adiabatic magneto−caloric and magneto-optical effects of paramagnetic terbium gallate garnet Tb₃Ga₅O₁₂ are calculated at 6 K in strong magnetic fields. Our calculated results are in agreement with the experimental data.