Short-wavelength cutoff effects in the ac fluctuation conductivity of superconductors
D.-N. Peligrad, M. Mehring, A. Dulčić
DOI 10.1103/PhysRevB.67.174515 · Physical Review B
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Abstract
The short-wavelength cutoff has been introduced in the calculation of the ac fluctuation conductivity of superconductors. It is shown that a finite cutoff leads to a breakdown of the scaling property in frequency and temperature. Also, it increases the phase φ of the complex conductivity (tanφ=σ2/σ1) beyond π/4 at Tc. Detailed expressions containing all essential parameters are derived for three-dimensional isotropic and anisotropic fluctuation conductivity. In the two-dimensional case we obtain individual expressions for the fluctuation conductivity for each term in the sum over discrete wave vectors perpendicular to the film plane. A comparison of the theory to the experimental microwave fluctuation conductivity is provided.
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