Method for critical current angular dependencies analysis of superconducting tapes

TL;DR

This paper introduces a new method based on an anisotropic pinning model to analyze the angular dependence of critical current in superconducting tapes, improving physical understanding over previous empirical approaches.

Contribution

The paper proposes a physically meaningful analysis method for critical current angular dependence using an anisotropic pinning model, applicable to Nb-Ti tapes and potentially extendable to HTS materials.

Findings

Applicable to Nb-Ti tapes with one peak in Ic(θ) dependence

Provides a physically meaningful analysis framework

Discusses extension to high-temperature superconductors

Abstract

Various applications of superconducting materials require accounting of anisotropy of the current-carrying capacity relative to magnetic field direction - Ic({\theta}). However, today there is no sufficiently comprehensive model that takes into account the anisotropy, therefore the angular dependences are usually not analysed, but only described using various mathematical formulas. As a result, the fitting parameters have no physical meaning and it is difficult to correlate the picture with the features of the microstructure. In this paper, we propose a method for analysing the critical current angular dependences based on the anisotropic pinning model. The applicability of this model for conventional superconducting Nb-Ti tapes with one peak in the Ic ({\theta}) dependence is shown. The possibility of extending this model to analyse the angular dependences of HTS materials is discussed.