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The resistive properties of layered HTSC BiSrCaCuO in the mixed state arecompared with those of thin films of conventional superconductors with weakdisorders (amorphous Nb_{1-x}0_{x} films) and with strong disorders(Nb_{1-x}O_{x} films with small grain structure). The excess conductivity isconsidered as a function of superconducting electron density and phasecoherence length. It is shown that the transition to the Abrikosov statediffers from the ideal case both in BiSrCaCuO and Nb_{1-x}O_{x} films, i.e. theappearance of long-range phase coherence is continuous transition in bothcases. The quantitative difference between thin films with weak and strongdisorders is greater than the one between layered HTSC and conventionalsuperconductors, showing that the dimensionality of the system, rather than thecritical temperature, is the key factor ruling fluctuation effectsComment: 17 pages, 5 figure

superconductor science and technology/superconductor science and technology

Comparison of the fluctuation influence on the resistive properties of the mixed state of Bi2Sr2CaCu2O8+xand of thin films of conventional superconductor