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| VOLUME 64 (1996) | ISSUE 6 |
PAGE 397
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Fluctuation-induced pseudogap in high-temperature superconductors
Federici F., Varlamov A.A.
We study the effect of fluctuations on the ac conductivity of a layered superconductor for c-axis electromagnetic wave polarization. The fluctuation contributions of different physical nature and sign (paraconductivity, Maki-Thompson anomalous contribution, one-electron density-of-states renormalization) are found to be suppressed by the external field at different characteristic frequencies (ωΑχ, ~ Τ Tc, u>mT ~ max{T Tc.t"1 }, wdos ~ mm{T,t~'}). As a result, the appearance of a nonmonotonic frequency dependence (pseudogap) in the infrared optical conductivity of high-temperature superconductor is predicted. PACS: 74.25.Gr, 74.40.+k
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![](/ps/988/article_15031_800_head.png "<b>We study the effect of fluctuations on the ac conductivity of a layered superconductor for c-axis electromagnetic wave polarization. The fluctuation contributions of different physical nature and sign (paraconductivity, Maki-Thompson anomalous contribution, one-electron density-of-states renormalization) are found to be suppressed by the external field at different characteristic frequencies </b><b><i>(ω<sub>Α</sub>χ, </i></b><b>~ Τ </b><b><i>T<sub>c</sub>, </i></b><b>u>m<sub>T</sub> ~ max{T Tc.t"<sup>1</sup> }, wdos ~ mm{T,t~'}). As a result, the appearance of a nonmonotonic frequency dependence (pseudogap) in the infrared optical conductivity of high-temperature superconductor is predicted.</b> <b>PACS: 74.25.Gr, 74.40.+k</b>")