ESR study in lightly doped La_(1-x)Sr_(x)MnO_(3)

TL;DR

This study presents the first systematic ESR analysis of lightly doped La_(1-x)Sr_(x)MnO_(3) single crystals, revealing phase transitions and Jahn-Teller distortion suppression related to Sr doping.

Contribution

It provides new insights into the structural and magnetic phase transitions in La_(1-x)Sr_(x)MnO_(3) using ESR, focusing on low Sr concentrations.

Findings

ESR signals from Mn^(3+) and Mn^(4+) reveal phase transitions.

Jahn-Teller distortion decreases with increased Sr doping.

Structural and magnetic phase changes are characterized by ESR.

Abstract

This is the first systematic ESR investigation of La_(1-x)Sr_(x)MnO_(3) single crystals for Sr concentrations x < 0.2. The rich phase diagram of this compound, which is dominated by the Jahn-Teller effect of Mn^(3+), is a matter of actual interest in connection with giant magnetoresistance phenomena. The ESR signal, which is due to both Mn^(3+) and Mn^(4+), directely probes the suppression of the Jahn-Teller distortion with increasing Sr concentration and reveals all characteristic structural and magnetic phase transitions.