Anisotropic AC Behavior of Multifilamentary Bi-2223/Ag Tapes

TL;DR

This paper investigates the anisotropic AC magnetic susceptibility of multifilamentary Bi-2223/Ag tapes, revealing directional dependence and phase effects in their superconducting response through experimental measurements.

Contribution

It provides new experimental insights into the anisotropic AC behavior of Bi-2223/Ag tapes, highlighting the influence of magnetic field orientation and phase differences.

Findings

Susceptibility exhibits two peaks with temperature dependence.

The smaller peak near 72K appears only for specific field directions.

Phase difference impacts the observed anisotropic AC response.

Abstract

In this communication, we report on the anisotropy of the superconducting properties of multifilamentary Bi-based tapes experimentally investigated by AC magnetic susceptibility measurements. The susceptibility $\chi= \chi' - j \chi''$ was measured using a commercial system and a couple of orthogonal pick-up coils. The $\chi''$ vs. temperature curves were shown to exhibit two peaks. The smaller of the peaks, occurring near T = 72K, was only visible for particular field directions and within a given frequency window. Such results point out the role played by the phase difference between the applied magnetic field and the internal magnetic field seen by the filaments.