Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)

M. Maschek; J. -P. Castellan; D. Lamago; D. Reznik; F. Weber

doi:10.1103/PhysRevB.97.245139

Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)

Strongly Correlated Electrons 2018-07-04 v1

Authors: M. Maschek , J. -P. Castellan , D. Lamago , D. Reznik , F. Weber

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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.

Keywords

polaron correlations phonon renormalization manganites colossal magnetoresistance inelastic neutron scattering La1-xSrxMnO3

Cite

@article{arxiv.1805.05596,
  title  = {Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)},
  author = {M. Maschek and J. -P. Castellan and D. Lamago and D. Reznik and F. Weber},
  journal= {arXiv preprint arXiv:1805.05596},
  year   = {2018}
}

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Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)

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