The Orbital Order Parameter in La0.95Sr0.05MnO3 probed by Electron Spin Resonance

TL;DR

This study investigates the temperature-dependent electron-spin resonance linewidth in La0.95Sr0.05MnO3 to understand its orbital order transition, revealing consistency with resonant x-ray scattering findings.

Contribution

It demonstrates how ESR linewidth and anisotropy can be used to determine orbital order parameters in manganites.

Findings

ESR linewidth varies with temperature across the orbital transition.

Linewidth anisotropy correlates with the orbital mixing angle.

Results align with resonant x-ray scattering data.

Abstract

The temperature dependence of the electron-spin resonance linewidth in La0.95Sr0.05MnO3 has been determined and analyzed in the paramagnetic regime across the orbital ordering transition. From the temperature dependence and the anisotropy of linewidth and $g$-value the orbital order can be unambiguously determined via the mixing angle of the wave functions of the $e_{\rm g}$-doublet. The linewidth shows a similar evolution with temperature as resonant x-ray scattering results.