Magnetic Capacitance in Variable-Valence Manganese Sulfides

The permittivity of TmxMn1-xS (0 < x < 0.15) solid solutions is measured in the frequency range of 10(2)-10(6) Hz at temperatures of 300-500 K in magnetic fields of up to 12 kOe. The migration and relaxation conductivity contributions to the electric polarization are established. The relaxation time and activation energy are calculated using the Debye model. A decrease in the capacitance and relaxation time in a magnetic field is observed. The electron polarization relaxation channel provided by recombination of the electron-hole pairs is found using the infrared spectroscopy investigations.