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• W2014700945 abstract "The complex dielectric function ${ensuremath{varepsilon}}_{1}+i{ensuremath{varepsilon}}_{2}$ of ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnO}}_{3}$ has been investigated for concentrations $0.1<~x<~0.175$ near the metal-to-insulator transition. Quasioptical spectroscopy technique were employed for frequencies 100 GHz $<~ensuremath{nu}<~1100$ GHz and temperatures 10 K $<~T<~300$ K. Both, the dielectric constant ${ensuremath{varepsilon}}_{1}$ and the conductivity ${ensuremath{sigma}}_{1}={ensuremath{varepsilon}}_{0}{ensuremath{varepsilon}}_{2}ensuremath{omega}$ of all samples were found to increase on cooling through the magnetic-ordering transition. From this observation and from the analysis of the frequency dependencies we conclude that the charge carriers are localized in a broader range of the phase diagram than generally accepted. We show that hopping or tunneling between localized states dominates the conductivity for Sr concentrations $x<~0.15$ and temperatures $T<300$ K. Even for ${mathrm{La}}_{0.725}{mathrm{Sr}}_{0.175}{mathrm{MnO}}_{3}$ the localization effects are observed at least 10 K below the magnetic-phase transition. Finally, the dielectric constant is observed to diverge on approaching the metal-insulator transition." @default.
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• W2014700945 title "Itinerant versus localized transport in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnO</…" @default.
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• W2014700945 doi "https://doi.org/10.1103/physrevb.59.12419" @default.
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