Visualizing high-temperature spin dynamics in La1-xCaxMnO3 from a mapping of EPR linewidth and g factor

TL;DR

This study uses EPR parameter mapping to analyze high-temperature spin dynamics in La1-xCaxMnO3, revealing the dominance of spin-spin relaxation in the paramagnetic regime of CMR manganites.

Contribution

It introduces a novel approach of mapping EPR parameters to investigate spin dynamics in manganites at high temperatures.

Findings

EPR parameter mapping effectively probes spin dynamics.

Spin-spin relaxation dominates the high-temperature paramagnetic phase.

Results enhance understanding of CMR manganites' phase diagram.

Abstract

This paper presents an analysis of electron paramagnetic resonance parameters, i.e., g factor, linewidth, and intensity on powder samples of La1-xCaxMnO3 at the commensurate carrier concentrations of x = N/8 (N = 1, 2, 3, 4, 5, 6, and 7). We demonstrate that the mapping of EPR parameters offers a powerful tool to investigate high-temperature spin dynamics in the phase diagram of colossal magnetoresistance (CMR) manganites. Our results convince that the spin-spin relaxation mechanism should dominate the high-temperature paramagnetic regime in CMR manganites.