Polaron framework to account for transport properties in metallic epitaxial manganite films

P. Graziosi, A. Gambardella, M. Prezioso, A. Riminucci, I. Bergenti, N. Homonnay, G. Schmidt, D. Pullini, D. Busquets-Mataix

Research output: Contribution to journalArticle

Abstract

We propose a model for the consistent interpretation of the transport behavior of manganese perovskites in both the metallic and insulating regimes. The concept of polarons as charge carriers in the metallic ferromagnetic phase of manganites also solves the conflict between transport models, which usually neglects polaron effects in the metallic phase, and, on the other hand, optical conductivity, angle-resolved spectroscopy, and neutron scattering measurements, which identify polarons in the metallic phase of manganites down to 6 K. Transport characterizations of epitaxial La0.7Sr0.3MnO3 thin films in the thickness range of 5-40 nm and temperature interval of 25-410 K have been accurately collected. We show that taking into account polaron effects allows us to achieve an excellent fit of the transport curves in the whole temperature range. The current carriers density collapse picture accurately accounts for the properties variation across the metal-insulator transitions. The electron-phonon coupling parameter γ estimations are in a good agreement with theoretical predictions. The results promote a clear and straightforward quantitative description of the manganite films involved in charge transport device applications and promises to describe other oxide systems involving a metal-insulator transition.

Original languageEnglish
Article number214411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number21
DOIs
Publication statusPublished - Jun 12 2014

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Manganites
Gene Conversion
Polarons
Metallic films
Metal insulator transition
Epitaxial films
polarons
Transport properties
transport properties
insulators
Optical conductivity
perovskites
Manganese
Neutron scattering
Charge carriers
metals
Parameter estimation
Oxides
Carrier concentration
Charge transfer

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Graziosi, P., Gambardella, A., Prezioso, M., Riminucci, A., Bergenti, I., Homonnay, N., ... Busquets-Mataix, D. (2014). Polaron framework to account for transport properties in metallic epitaxial manganite films. Physical Review B - Condensed Matter and Materials Physics, 89(21), [214411]. https://doi.org/10.1103/PhysRevB.89.214411

Polaron framework to account for transport properties in metallic epitaxial manganite films. / Graziosi, P.; Gambardella, A.; Prezioso, M.; Riminucci, A.; Bergenti, I.; Homonnay, N.; Schmidt, G.; Pullini, D.; Busquets-Mataix, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 21, 214411, 12.06.2014.

Research output: Contribution to journalArticle

Graziosi, P, Gambardella, A, Prezioso, M, Riminucci, A, Bergenti, I, Homonnay, N, Schmidt, G, Pullini, D & Busquets-Mataix, D 2014, 'Polaron framework to account for transport properties in metallic epitaxial manganite films', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 21, 214411. https://doi.org/10.1103/PhysRevB.89.214411
Graziosi, P. ; Gambardella, A. ; Prezioso, M. ; Riminucci, A. ; Bergenti, I. ; Homonnay, N. ; Schmidt, G. ; Pullini, D. ; Busquets-Mataix, D. / Polaron framework to account for transport properties in metallic epitaxial manganite films. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 21.
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