Superconducting properties of Tl-doped PbTe

TL;DR

This study systematically investigates the superconducting properties of Tl-doped PbTe, revealing it as a weak-coupled Type II superconductor in the dirty limit with implications for the charge Kondo model.

Contribution

It provides detailed measurements of superconducting parameters in Tl-doped PbTe up to 1.4% Tl concentration, supporting the weak-coupled BCS description.

Findings

Pb_{1-x}Tl_{x}Te is a Type II superconductor.

Superconductivity occurs in the dirty limit.

Results support the charge Kondo model implications.

Abstract

Tl-doped PbTe (Pb_{1-x}Tl_{x}Te) is an anomalous superconductor with a remarkably high maximum T_c value given its relatively low carrier concentration. Here, we present results of systematic measurements of superconducting parameters for this material, for Tl concentrations up to x = 1.4%. We find that it is a Type II, weak-coupled BCS superconductor in the dirty limit and discuss implications for the applicability of the charge Kondo model recently proposed to account for superconductivity in this system.