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• W2092127780 abstract "We present measurements of the low-frequency optical conductivity of epitaxial thin films of $mathrm{Ca}mathrm{Ru}{mathrm{O}}_{3}$, obtained with time-domain terahertz spectroscopy. We resolve a narrow conductivity peak near $ensuremath{omega}=0$ that deviates from Drude dynamics down to very low frequencies. By determining the spectral weight of this feature we estimate that the carrier kinetic energy changes by $0.2phantom{rule{0.3em}{0ex}}mathrm{eV}$ per site upon cooling from room temperature and, where measurements are available, the strength of this change correlates well with magnetism in three-dimensional ruthenium oxides. We show that the time-domain terahertz technique provides a precise measure of the optical mass renormalization in extended Drude analysis and we show that this turns up sharply as the temperature is reduced below $50phantom{rule{0.3em}{0ex}}mathrm{K}$. We express our results in terms of a distribution of scattering rates and show how this description relates to other approaches in the literature. Our measurements are consistent with an anomalous power law description over a narrow range of frequencies and temperatures but significant deviations are observed and discussed. We show that our results are not described by a $ensuremath{omega}∕T$ scaling form." @default.
• W2092127780 created "2016-06-24" @default.
• W2092127780 creator A5017831224 @default.
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• W2092127780 date "2006-10-25" @default.
• W2092127780 modified "2023-09-27" @default.
• W2092127780 title "Terahertz-frequency carrier dynamics and spectral weight redistribution in the nearly magnetic metal<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi><mml:mi mathvariant=normal>Ru</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W2092127780 doi "https://doi.org/10.1103/physrevb.74.165115" @default.
• W2092127780 hasPublicationYear "2006" @default.
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