Comments on "Fundamental nature of the self-field critical current in superconductors", arxiv:2409.16758

TL;DR

This paper critiques previous claims about a universal self-field critical current in superconductors, providing experimental evidence that challenges the validity of those claims and the associated theoretical framework.

Contribution

It offers a critical analysis demonstrating that the proposed universal self-field critical current and fundamental limit are experimentally invalid, refuting prior theoretical assertions.

Findings

Experimental evidence contradicts the universal self-field critical current claim.

The proposed fundamental limit for self-field Jc is proven incorrect.

The critique invalidates key claims in the referenced articles.

Abstract

We provide comments on article "Fundamental nature of the self-field critical current in superconductors" by Talantsev and Tallon, arXiv:2409.16758 and https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4978589 related to the predictions of the key equation proposed in article "Universal self-field critical current for thin-film superconductors," by Talantsev and Tallon, Nat. Commun. 6 (2015) 7820. We respond to claims and assertions made in these articles and also show that the so-called "Universal self-field critical current" and the "fundamental limit" for self-field Jc suggested by Talantsev and Tallon, has been proven incorrect experimentally and this invalidates the key claims and findings stated in both these articles.