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- W2073284857 abstract "The complex transmission coefficient for millimeter and submillimeter waves incident on a ${mathrm{Ba}}_{0.6}$${mathrm{K}}_{0.4}$${mathrm{BiO}}_{3}$ thin film (82 nm) has been measured over a frequency range of 200--1200 GHz at temperatures above and below ${mathit{T}}_{mathit{c}}$ using coherent time-domain spectroscopy. We observe a dramatic change in both the magnitude and phase of the terahertz transmission in the superconducting state caused by a rapid carrier condensation. Both the real (${mathrm{ensuremath{sigma}}}_{1}$) and imaginary (${mathrm{ensuremath{sigma}}}_{2}$) parts of the complex conductivity are determined directly from the amplitude and phase of the transmitted electric field without the need for a Kramers-Kronig analysis. By fitting ${mathrm{ensuremath{sigma}}}_{2}$ in the framework of BCS theory, a superconducting gap 2ensuremath{Delta}(0)=6.9 meV=3.8${mathit{k}}_{mathit{B}}$${mathit{T}}_{mathit{c}}$ is obtained. Below ${mathit{T}}_{mathit{c}}$, the ${mathrm{ensuremath{sigma}}}_{1}$ is rapidly enhanced for ensuremath{omega}/2ensuremath{pi}500 GHz, which is attributed to the BCS coherence effects. However, the conductivity exhibits monotonic temperature dependence and no clear ${mathrm{ensuremath{sigma}}}_{1}$(T) peak is observed throughout the frequency range measured. The high-frequency penetration depth (ensuremath{sim}600 nm) is also extracted and discussed. Our results are consistent with a picture of BCS moderate coupling superconductivity in an intermediate to dirty limit." @default.
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- W2073284857 date "1995-08-01" @default.
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- W2073284857 title "Terahertz transmission of a<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>K</mml:mi></mml:mrow><mml:mrow><…" @default.
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- W2073284857 doi "https://doi.org/10.1103/physrevb.52.3607" @default.
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