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- W2033451317 abstract "The metal-insulator (MI) transition in epitaxial thin films of ${text{La}}_{0.75}{text{Ca}}_{0.25}{text{MnO}}_{3}$ (LCMO) is accompanied by the appearance of an intrinsic electrical nonlinearity. The latter, probed by electrical third harmonic voltage, ${U}_{3ensuremath{omega}}$, or resistance, ${R}_{3ensuremath{omega}}=d{U}_{3ensuremath{omega}}/dJ$, is drastically enhanced in the vicinity of the MI transition, ${T}_{text{MI}}=267text{ }text{K}$. Applied magnetic field, $B=5text{ }text{T}$, suppresses the nonlinearity, resulting in a huge ``nonlinear'' ${text{CMR}}_{3ensuremath{omega}}({T}_{text{MI}})ensuremath{sim}{10}^{5}%$. ${R}_{3ensuremath{omega}}$ shows a peculiar low-frequency $(ensuremath{omega}ensuremath{le}1text{ }text{kHz})$ dependence, ${R}_{3ensuremath{omega}}ensuremath{sim}{(ensuremath{omega}text{ensuremath{-}}{ensuremath{omega}}_{0})}^{n}$, with exponent, $n$, changing across the MI transition from $nensuremath{sim}1,5--2$ for $Tensuremath{ge}{T}_{text{MI}}$ to $n=1$ $(T<{T}_{text{MI}})$. The observed electrical nonlinearity in LCMO reflects the behavior of correlated polarons, the number of which dramatically enhances in the vicinity of ${T}_{text{MI}}$. We argued that correlated polarons, considered as electric-elastic quadrupoles, provide a nonlinear (quadratic) coupling to the electric field, yielding a third harmonic electric nonlinearity in LCMO. The reference film of ${text{La}}_{0.7}{text{Sr}}_{0.3}{text{MnO}}_{3}$ (LSMO), a prototypic double exchange system with second-order phase transition, is characterized as a linear metallic material in the whole range of temperatures $(T=10--400text{ }text{K})$, magnetic fields $(B=0--5text{ }text{T})$, and frequencies $(ensuremath{omega}=1--1000text{ }text{Hz})$." @default.
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- W2033451317 date "2009-04-09" @default.
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- W2033451317 title "Electrical nonlinearity in colossal magnetoresistance manganite films: Relevance of correlated polarons" @default.
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- W2033451317 doi "https://doi.org/10.1103/physrevb.79.134413" @default.
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