Evidence for small or intermediate-size polarons in the ferromagnetic state of manganites

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dc.creatorZhao, Guo-meng
dc.creatorKang, D. J.
dc.creatorPrellier, W.
dc.creatorRajeswari, M.
dc.creatorKeller, H.
dc.creatorVenkatesan, T.
dc.creatorGreene, R. L.
dc.date2000-08-02
dc.date.accessioned2026-07-07T02:38:23Z
dc.date.available2026-07-07T02:38:23Z
dc.descriptionOxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of La_{0.75}Ca_{0.25}MnO_{3} and Nd_{0.7}Sr_{0.3}MnO_{3}. We found that the residual resistivity ρ_{o} increases by about 15(3)% upon replacing ^{16}O by ^{18}O. This provides strong evidence for the presence of small or intermediate-size polarons in the metallic ferromagnetic state. Furthermore, the temperature dependent part of the resistivity at low temperatures consists of an AT^{4.5} term contributed from 2-magnon scattering, and a Bω_{s}/\sinh^{2}(\hbarω_{s}/2k_{B}T) term which arises from scattering by a soft optical phonon mode. The absolute magnitudes of the coefficient A and the phonon frequency \hbarω_{s} for both isotope samples are in quantitative agreement with theoretical predictions.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0008029
dc.identifierhttp://arxiv.org/abs/cond-mat/0008029
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16648
dc.subjectStrongly Correlated Electrons
dc.titleEvidence for small or intermediate-size polarons in the ferromagnetic state of manganites
dc.typetext

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