Changing the type of superconductivity by magnetic and potential scattering

TL;DR

This paper investigates how magnetic and potential scattering can alter the type of superconductivity, demonstrating that magnetic impurities can convert a type-II superconductor into a type-I by analyzing critical fields.

Contribution

It introduces a theoretical framework showing that magnetic impurities can change a superconductor's type, a novel insight into controlling superconducting properties.

Findings

Magnetic impurities can induce a transition from type-II to type-I superconductivity.

The ratio of critical fields $H_{c2}/H_c$ is key to understanding this transition.

The study provides a method to evaluate critical fields at arbitrary temperatures.

Abstract

By evaluating the upper and thermodynamic critical fields, $H_{c2}$ and $H_c$, and their ratio $H_{c2}/H_c $ at arbitrary temperatures, we argue that situations are possible when a type-II material is transformed to type-I by adding magnetic impurities.