Critical temperature modification of low dimensional superconductors by spin doping

TL;DR

This study investigates how ion implantation of Fe and Mn into Al thin films affects their superconducting critical temperature, revealing a stronger suppression by Mn and limitations of existing models at higher ion concentrations.

Contribution

It provides experimental data on the effects of Fe and Mn doping on Al superconductors and highlights discrepancies with current theoretical models at higher doping levels.

Findings

Mn suppresses critical temperature more strongly than Fe.

Existing models accurately predict suppression at low concentrations.

Discrepancies between models and experiments emerge above 0.1 at.% doping.

Abstract

Ion implantation of Fe and Mn into Al thin films was used for effective modification of Al superconductive properties. Critical temperature of the transition to superconducting state was found to decrease gradually with implanted Fe concentration. it was found that suppression by Mn implantation much stronger compared to Fe. At low concentrations of implanted ions, suppression of the critical temperature can be described with reasonable accuracy by existing models, while at concentrations above 0.1 at.% a pronounced discrepancy between the models and experiments is observed.