Electron paramagnetic resonance studies of the insulating ferromagnetic manganite Nd_0.8Pb_0.2MnO_3 above the transition temperature

摘要

Single crystals of Nd_{1-x}Pb_{x}MnO_{3} with x=0.2 are grown by hightemperature solution growth technique using PbO-PbF_{2} flux. Magnetizationstudies on the samples show a transition to a ferromagnetic state below T_c ~125 K and the resistivity measurements show it to be an insulator throughoutthe temperature range 50 - 300 K. Electron Paramagnetic Resonance studies havebeen performed for T > T_{C} with a view to comparing the results with those onmetallic ferromagnetic manganites. The temperature dependence of variousparameters like g-value, linewidth and intensity has been studied in thetemperature range 150 - 300 K. It is found that they behave in a manner similarto that exhibited by metallic ferromagnetic manganites.