Condensed Matter Physics, 1998, vol. 1, No 1(13), p. 69-87, English

Authors:E.Schachinger, I.Schurrer (Institut fur Theoretische Physik, Technische Universitat Graz, Petersgasse 16, A-8010 Graz, Austria)

This paper discusses a phenomenological model used to describe various properties of a dx2-y2 superconductor in its temperature as well as frequency dependence, namely, the London penetration depth, the optical conductivity, the microwave conductivity, and the electronic thermal conductivity. We assume the CuO2 planes to be the dominant feature for superconductivity and develop a 2D-formalism in which inelastic scattering is modelled explicitly by a spectral density which describes a fluctuation spectrum responsible for the superconducting transition and also for the large inelastic scattering observed in the normal state above the critical temperature Tc. The feedback effect of superconductivity on the spectral density is modelled by a temperature dependent low frequency cutoff. Theoretical results are compared with the experimental data and the fact that such a model allows a consistent description of a variety of phenomena is then used to formulate constraints on possible mechanisms of superconductivity in oxides.

Key words: high- Tc superconductivity, London penetration depth, optical conductivity, electronic thermal conductivity
Comments: Figs. 7, Refs. 34, Tabs. 0.

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