The Influence of Structural Inhomogeneities on Intragranular Properties of Y- and Bi-based Superconductors

TL;DR

This study investigates how structural inhomogeneities affect the intragranular superconducting properties of Y- and Bi-based ceramics using AC magnetic susceptibility measurements, revealing composition-dependent step-like features.

Contribution

It provides new insights into the impact of atomic substitutions on superconducting inhomogeneities and their temperature-dependent effects in ceramic materials.

Findings

Step-like regions observed in AC magnetic susceptibility curves.

Temperature steps depend on sample composition and atom substitution.

Y-based samples show 1-2 K steps; Bi-based samples show about 5 K steps.

Abstract

The measurements of temperature dependence of AC magnetic susceptibility were used to study the influence of inhomogeneities on intragranular superconducting properties of YBa2Cu3-xMxOy (M=Fe,x=0.005; Al,x=0.01; Cr,x=0.01), Bi1.7Pb0.2Sb0.1Sr2Ca2Cu3Oy and Bi1.5Pb0.3Sb0.2Sr2Ca2Cu3Oy ceramics. It is found that step-like regions are revealed on AC magnetic field dependence curves Tmg(ho) of hysteresis losses peak temperature for superconducting granuls. The steps at temperature scale depend on sample's composition as well as on the type of atoms sabstituted for the copper. They range from 1 to 2 K for Y-based and about 5 k for Bi-basedsamples. Possible interpretation of the obtained results is presented.