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- W2045207047 abstract "The high-temperature resistivity of ${mathrm{La}}_{0.7}{mathrm{Ca}}_{0.3}{mathrm{MnO}}_{3}$ and ${mathrm{La}}_{0.7}{mathrm{Ba}}_{0.3}{mathrm{MnO}}_{3}$ thin films on various substrates ${mathrm{LaAlO}}_{3},{mathrm{SrTiO}}_{3},$ and Si was investigated. We show that the intrinsic resistivity of high-quality epitaxial films in the paramagnetic phase has a thermally activated form, whereas the extrinsic resistivity found in polycrystalline films follows a variable range hopping law. The small activation energies measured are not compatible with the formation of a band gap; instead they indicate polaron hopping. The polaron mobility is drastically enhanced by the ferromagnetic ordering. We show that the reduction of the polaron activation energy below the Curie temperature is linear in the magnetization. The shift of the metal-insulator transition temperature depends sublinearly on the applied field." @default.
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- W2045207047 date "1998-11-01" @default.
- W2045207047 modified "2023-10-11" @default.
- W2045207047 title "Polaronic effects on the resistivity of manganite thin films" @default.
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- W2045207047 doi "https://doi.org/10.1103/physrevb.58.11519" @default.
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