The magnetoelastic effect in CoxMn1−xS solid solutions

The magnetization of cation-substituted CoxMn1−xS sulfides upon cooling in zero magnetic field and in a field in the temperature range 4–300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H<0.1T and at T<240K. The interrelation between the magnetic and elastic subsystems of the CoxMn1−xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Néel temperature. The features of the physical properties are explained by orbital ordering.