Fluctuation-induced pseudogap in the infrared optical conductivity of high-temperature superconductors

Francesca Federici; Andrei A. Varlamov

doi:10.1103/PhysRevB.55.6070

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Fluctuation-induced pseudogap in the infrared optical conductivity of high-temperature superconductors

Francesca Federici, Andrei A. Varlamov

DOI 10.1103/PhysRevB.55.6070 · Physical Review B

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Abstract

We study the effect of fluctuations on the ac conductivity of a layered superconductor both for c-axis and ab-plane electromagnetic wave polarizations. The fluctuation contributions of different physical nature and signs (paraconductivity, Maki-Thompson anomalous contribution, one-electron density of states renormalization) are found to be suppressed by the external field at different characteristic frequencies (ωAL∼T-Tc, ωMT∼max{T-Tc,τφ−1}, ωDOS∼min{T,τ−1} for the two-dimensional case). As a result the appearance of the nonmonotonic frequency dependence (pseudogap) in the infrared optical conductivity of high-temperature superconductor film is predicted. The effect has to be especially pronounced in the case of the electromagnetic field polarization along the c axis.