M\"{o}ssbauer Effect Probe of Local Jahn-Teller distortion in Fe-doped Colossal Magnetoresistive Manganites

TL;DR

This study uses Mössbauer spectroscopy to detect local Jahn-Teller distortions and estimate coupling strength in Fe-doped LaCaMnO3, revealing a correlation with magnetic phases and demonstrating a new investigative technique.

Contribution

It introduces Mössbauer spectroscopy as a novel method to analyze local Jahn-Teller distortions and coupling in Fe-doped manganites, linking structural and magnetic properties.

Findings

Jahn-Teller distortion confirmed by Mössbauer spectra.

Jahn-Teller coupling strength varies with Ca concentration.

Correlation between Jahn-Teller coupling and magnetic phase diagram.

Abstract

Local structure of the Fe-doped La$_{1-x}$Ca$_{x}$MnO$_{3}$ (x=0.00-1.00) compounds has been investigated by means of M\"{o}ssbauer spectroscopy. $^{57}$Fe M\"{o}ssbauer spectra provide a direct evidence of Jahn-Teller distortion in these manganites. On the basis of M\"{o}ssbauer results, the Jahn-Teller coupling was estimated. It is noteworthy that Ca-concentration dependence of Jahn-Teller coupling strength is very consistent with the magnetic phase diagram. Our results reveal that M\"{o}ssbauer spectroscopy can not only detect the local structural distortion, but also provide a technique to investigate Jahn-Teller coupling of Fe-doped La$_{1-x}$Ca$_{x}$MnO$_{3}$ colossal magnetoresistive perovskites.