Comparison of the fluctuation influence on the resistive properties of the mixed state of BiSrCaCuO and of thin films of conventional superconductor

TL;DR

This paper compares the resistive properties and fluctuation effects in layered high-temperature superconductor BiSrCaCuO with conventional superconducting films, revealing the importance of system dimensionality over critical temperature.

Contribution

It demonstrates that the transition to the Abrikosov state is a continuous process influenced by system dimensionality rather than just critical temperature.

Findings

Long-range phase coherence transition is continuous in both materials.

Dimensionality significantly affects fluctuation effects more than critical temperature.

Differences in disorder levels impact resistive properties and transition behavior.

Abstract

The resistive properties of layered HTSC BiSrCaCuO in the mixed state are compared with those of thin films of conventional superconductors with weak disorders (amorphous Nb_{1-x}0_{x} films) and with strong disorders (Nb_{1-x}O_{x} films with small grain structure). The excess conductivity is considered as a function of superconducting electron density and phase coherence length. It is shown that the transition to the Abrikosov state differs from the ideal case both in BiSrCaCuO and Nb_{1-x}O_{x} films, i.e. the appearance of long-range phase coherence is continuous transition in both cases. The quantitative difference between thin films with weak and strong disorders is greater than the one between layered HTSC and conventional superconductors, showing that the dimensionality of the system, rather than the critical temperature, is the key factor ruling fluctuation effects