Superconducting and Topological Properties in Centrosymmetric PbTaS2 Single Crystals

TL;DR

This study reveals that centrosymmetric PbTaS2 single crystals exhibit superconductivity at 2.6 K and possess topological nodal line features, making it a promising material for exploring topological superconductivity.

Contribution

The paper demonstrates that PbTaS2 is a weakly coupled type-II superconductor with topological nodal line characteristics, combining superconductivity and topological properties in a centrosymmetric material.

Findings

PbTaS2 is a weakly coupled type-II superconductor with Tc = 2.6 K.

Band structure calculations show four nodal lines near the Fermi energy.

Presence of drumhead-like surface states suggests topological nodal line semimetal behavior.

Abstract

We report the superconductivity of PbTaS2 single crystals with the centrosymmetric structure. The systematic measurements of magnetization, electric transport and specific heat indicate that PbTaS2 is a weakly coupled type-II superconductor with transition temperature Tc = 2.6 K. Furthermore, the band structure calculations predicted four nodal lines near the Fermi energy with drumhead-like surface states, suggesting centrosymmetric PbTaS2 is a candidate of topological nodal line semimetals. These results demonstrate that PbTaS2 may open up another avenue for further exploring the properties of superconductivity and topological nodal-line states.