Polaronic correlations and phonon renormalization in L a1-x S rxMn O3 (x=0.2, 0.3)

Title

Polaronic correlations and phonon renormalization in L a1-x S rxMn O3 (x=0.2, 0.3)

 Author

Maschek, M. (TU Delft RST/Fundamental Aspects of Materials and Energy; Karlsruhe Institut für Technologie)
Castellan, J. P. (Karlsruhe Institut für Technologie; CEA-Saclay)
Lamago, D. (Karlsruhe Institut für Technologie; CEA-Saclay)
Reznik, D. (University of Colorado)
Weber, F. (Karlsruhe Institut für Technologie)

Date

2018-06-25

 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 colossal magnetoresistance.


 To reference this document use:

http://resolver.tudelft.nl/uuid:c74844ec-765c-489e-8c00-ccdc43fb9cdd

 DOI

https://doi.org/10.1103/PhysRevB.97.245139

 ISSN

2469-9950

 Source

Physical Review B, 97 (24)

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2018 M. Maschek, J. P. Castellan, D. Lamago, D. Reznik, F. Weber
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