Tip-induced Superconductivity Coexisting with Preserved Topological Properties in Line-nodal Semimetal ZrSiS

Abstract

ZrSiS was recently shown to be a new material with topologically non-trivial band structure which exhibits multiple Dirac nodes and a robust linear band dispersion up to an unusually high energy of 2\,eV. Such a robust linear dispersion makes the topological properties of ZrSiS insensitive to perturbations like carrier doping or lattice distortion. Here we show that a novel superconducting phase with a remarkably high $T_c$ of 7.5\,K can be induced in single crystals of ZrSiS by a non-superconducting metallic tip of Ag. From first-principles calculations we show that the observed superconducting phase might originate from dramatic enhancement of density of states due to the presence of a metallic tip on ZrSiS. Our calculations also show that the emerging tip-induced superconducting phase co-exists with the well preserved topological properties of ZrSiS.

with supplementary materials

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• Electronic structure of the surface superconducting Weyl semimetal PtBi${}_2$
• Tip-induced Superconductivity
• Fragile topology in nodal-line semimetal superconductors
• A compact inertial nano-positioner operating at cryogenic temperatures
• Broken time-reversal symmetry detected by tunneling spectroscopy of superconducting Pd-doped CaAgP