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

TL;DR

This study investigates the electron paramagnetic resonance properties of Nd_{0.8}Pb_{0.2}MnO_{3} single crystals above the ferromagnetic transition temperature, revealing behaviors similar to metallic manganites despite being insulating.

Contribution

It provides the first detailed EPR analysis of insulating ferromagnetic manganite Nd_{0.8}Pb_{0.2}MnO_{3} above T_c, comparing its magnetic resonance parameters with metallic counterparts.

Findings

EPR parameters vary with temperature similarly to metallic manganites

The material remains insulating across the studied temperature range

EPR results suggest common magnetic dynamics in insulating and metallic manganites

Abstract

Single crystals of Nd_{1-x}Pb_{x}MnO_{3} with x=0.2 are grown by high temperature solution growth technique using PbO-PbF_{2} flux. Magnetization studies 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 throughout the temperature range 50 - 300 K. Electron Paramagnetic Resonance studies have been performed for T > T_{C} with a view to comparing the results with those on metallic ferromagnetic manganites. The temperature dependence of various parameters like g-value, linewidth and intensity has been studied in the temperature range 150 - 300 K. It is found that they behave in a manner similar to that exhibited by metallic ferromagnetic manganites.