Temperature-Dependent X-Ray Absorption Spectroscopy of Colossal Magnetoresistive Perovskites

TL;DR

This study investigates how temperature affects the X-ray absorption spectra of certain manganite perovskites, revealing a link between spectral features and Jahn-Teller distortions that influence their magnetic properties.

Contribution

It provides new insights into the relationship between spectral features and structural distortions in colossal magnetoresistive perovskites.

Findings

Disappearance of pre-edge splitting correlates with Jahn-Teller distortions.

Different compounds show varying spectral line shapes above Curie temperature.

Structural distortions influence electronic structure as observed in spectra.

Abstract

The temperature dependence of the O K-edge pre-edge structure in the x-ray absorption spectra of the perovskites La(1-x)A(x)MnO(3), (A = Ca, Sr; x = 0.3, 0.4) reveals a correlation between the disappearance of the splitting in the pre-edge region and the presence of Jahn-Teller distortions. The different magnitudes of the distortions for different compounds is proposed to explain some dissimilarity in the line shape of the spectra taken above the Curie temperature.