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- W1663559552 abstract "We report on broadband frequency-dependent conductivity experiments on ${mathrm{La}}_{7/8}{mathrm{Sr}}_{1/8}{mathrm{MnO}}_{3}$ that cover the frequency range from 0.3 meV $(ensuremath{approx}3 {mathrm{cm}}^{ensuremath{-}1})$ to 5 eV $(ensuremath{approx}4ifmmodetimeselsetexttimesfi{}{10}^{4} {mathrm{cm}}^{ensuremath{-}1}).$ At all frequencies investigated, the temperature dependence of ${ensuremath{sigma}}^{ensuremath{'}}(ensuremath{nu})$ reflects the structural and magnetic phase transitions. At low frequencies we find the typical characteristics of hopping conduction. The optical conductivity at frequencies above the phonon modes reveals strong changes at the structural and magnetic phase transitions and can best be described in terms of polaronic conduction. In addition, we carefully analyzed the temperature dependence of the phonon modes. Distinct anomalies in the eigenfrequencies and the appearance of side bands signal structural phase transitions." @default.
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- W1663559552 date "2000-12-15" @default.
- W1663559552 modified "2023-10-16" @default.
- W1663559552 title "High-frequency conductivity and phonon properties of<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>7</mml:mn><mml:mo>/</mml:mo><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:…" @default.
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- W1663559552 doi "https://doi.org/10.1103/physrevb.62.15673" @default.
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