Sn0.06Cr[formula omitted]Te[formula omitted]: A skyrmion superconductor

Abstract

Topological superconductors are an exciting class of quantum materials from the point of view of the fundamental sciences and potential technological applications. Here, we report on the successful introduction of superconductivity in a ferromagnetic layered skyrmion system CrTe, obtained by the Sn intercalation, below a transition temperature of 3.5 K. We observe several interesting physical properties, such as superconductivity, magnetism, and the topological Hall effect, simultaneously in this system. Despite the magnetism and Meissner effects being anisotropic, the superconductivity observed from the in-plane electrical resistivity () is nearly isotropic between and , suggesting separate channels of conduction electrons responsible for the superconductivity and magnetism of this system, which is also supported by our spin-resolved DFT calculations. We identify two orders of higher carrier density in superconducting SnCrTe than the parent CrTe. A jump in the specific heat is noticed around the with a volume fraction of 33%, confirming the bulk superconductivity in SnCrTe. In addition to the introduction of superconductivity, tuning of topological Hall properties is noticed with Sn intercalation. Our observation of superconductivity in a skyrmion lattice brings up a new class of topological quantum materials.