Characterisation of HTSC ceramics from their resistive transition

TL;DR

This paper models the resistivity transition in high-temperature superconductor ceramics by considering fluxon dynamics influenced by pinning and viscous forces, providing a detailed understanding of their electrical behavior.

Contribution

It introduces a model incorporating local Lorentz force-induced fluxon motion with temperature-dependent pinning to describe resistivity in HTSC ceramics.

Findings

Resistivity depends on fluxon motion influenced by pinning and viscous forces.

Characteristic parameters include pinning force density and viscous drag coefficients.

Model explains temperature, current, and magnetic field effects on resistance.

Abstract

The resistivity vs. temperature relation in bulk ceramic HTSC under self-field conditions as well as in weak external magnetic fields is modelled by local Lorentz force induced fluxon motion with temperature dependent pinning. A pinning force density and two viscous drag coefficients in intergrain and intragrain regions, respectively, can be used as characteristic parameters describing the temperature, current, and external field dependences of the sample resistance.