Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)
M. Maschek, J.-P. Castellan, D. Lamago, D. Reznik, F. Weber
TL;DR
This study investigates phonon renormalization and polaron correlations in La1-xSrxMnO3 compounds, revealing that polaron lifetime correlates with colossal magnetoresistance, despite similar phonon effects in different doping levels.
Contribution
It provides a comparative analysis of phonon and polaron behaviors in La1-xSrxMnO3 compounds with different magnetoresistance levels, highlighting the role of polaron lifetime.
Findings
Phonon renormalization is similar in both samples.
Dynamic CE-type polaron correlations are observed.
Polaron lifetime correlates with magnetoresistance strength.
Abstract
According to standard theory the magnetoresistance magnitude in ferromagnetic manganites crucially depends on the electron-phonon coupling strength. We showed that in La0.7Sr0.3MnO3 the phonon renormalization is strong, despite its relatively small magnetoresistance. Here, we report results of a similar inelastic neutron scattering investigation of a closely related compound, La0.8Sr0.2MnO3, where the magnetoresistance is enhanced. We find similar phonon renormalization and dynamic CE-type polaron correlations as in La0.7Sr0.3MnO3. However, quantitative comparison of the results for the two samples shows that only polaron lifetime is well correlated with the strength of the CMR.
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