Intergrain connectivity and resistive broadening in vortex state: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors

TL;DR

This study compares grain connectivity and transition broadening in MgB2, NbSe2, and Bi2Sr2Ca2Cu3O10 superconductors using magnetoresistance and RF techniques to understand their vortex state properties.

Contribution

It provides a comparative analysis of intergrain connectivity and resistive broadening in three different superconductors using multiple measurement techniques.

Findings

H-T phase diagrams established for all three materials.

Bulk pinning force constants evaluated from RF response.

Differences in fluctuation and connectivity effects observed among the materials.

Abstract

Magnetoresistance and radio frequency penetration depth techniques are used to study grain connectivity and broadening of superconducting transition. We study and compare these issues in clean polycrytalline samples of three different superconducting systems e.g. MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10. From the rf response, the bulk pinning force constant is evaluated. From high field transport measurements, H-T phase diagram is ascertained for the three systems with varying degrees of fluctuation and connectivity.