Magnetic Properties of La_(0.9)Ag_(0.1)(Mn_(1-x)Co_x)O_3 under Pressure

摘要

In our paper we report on magnetic properties of La_(0.90)Ag_(0.10)(CO_xMn_(1-x))O_3 ferromagnetic ceramics(x = 0.00 and0.03) which were studied in pressures up to 0.9 GPa. Magnetic transition at the Curie temperature T_c is accompanied with metal insulator transition with a maximum at T~* which is shifted to lower temperature with applied magnetic field. The Curie temperature is decreasing with substitution of Co for Mn and is ranging from 178 K to 126.5 K. Hydrostatic pressure increases T_c for sample with x = 0.03 nearly linearly with the pressure coefficient d T_c/dp = 5.7 K/GPa. Hysteresis loop is affected'marginally； μ_s increases and H_c decreases with pressure.