Emergent superconductivity by Re doping in type -II Weyl semimetal NiTe2

TL;DR

This paper reports the discovery of superconductivity in Re-doped NiTe2, a type-II Weyl semimetal, achieved through chemical doping which enhances electron-phonon interactions leading to superconductivity at 2.36 K.

Contribution

It demonstrates that Re doping induces superconductivity in NiTe2 and elucidates the role of hole doping and phonon softening in this process.

Findings

Superconductivity observed at 2.36 K in Re-doped NiTe2.

Re substitution causes hole doping and enhances electron-phonon coupling.

Superconductivity is facilitated by phonon softening due to Re doping.

Abstract

Recently topological superconductors emerge as a platform to realise Majorana Fermions which has potential application in topological quantum computation. Superconductivity in these materials can be realised by chemical doping, high pressure or proximity effect. Herein we report the emergent superconductivity in single-crystals of Re doped type-II Weyl semimetal NiTe2. The magnetic and transport measurements highlight that Re substitution in Ni-site induces superconductivity at a maximum temperature of 2.36 K. Hall effect and specific heat measurements indicate that Re substitution is doping hole and facilitates the emergence of superconductivity by phonon softening and enhancing the electron-phonon coupling.