Possible high temperature superconductivity in Ti-doped A-Sc-Fe-As-O (A= Ca, Sr) system

TL;DR

This study explores Ti doping in specific Fe-As-O compounds, revealing that high doping levels induce superconductivity with transition temperatures up to 45 K, indicating potential high-temperature superconductivity.

Contribution

It demonstrates that Ti substitution in A-Sc-Fe-As-O compounds can induce superconductivity at relatively high temperatures, a novel finding in this material system.

Findings

Superconductivity appears with Ti doping up to 45 K.

High doping increases carrier concentration.

Ti doping induces superconductivity in these compounds.

Abstract

We report a systematic study on the effect of partial substitution of Sc$^{3+}$ by Ti$^{4+}$ in Sr$_{2}$ScFeAsO$_{3}$, Ca$_{2}$ScFeAsO$_{3}$ and Sr$_{3}$Sc$_{2}$Fe$_{2}$As$_{2}$O$_{5}$ on their electrical properties. High level of doping results in an increased carrier concentration and leads to the appearance of superconductivity with the onset of T$_{c}$ up to 45 K.