Two-fold anisotropic superconducting state in topological superconductor Sn4Au

Abstract

Here we report the anisotropic magnetotransport properties in the superconducting state of a Sn4Au single crystal. The Sn4Au single crystal is synthesized through an easy melt growth method. Superconducting properties are evidenced from resistivity vs. temperature (ρ-T) and DC magnetization measurements. Isothermal magnetization measurements (M-H) hint toward type-II superconductivity in Sn4Au. In-plane and out-of-plane ρ-H measurements show anisotropic behavior of the upper critical field at temperatures below superconducting transition (T c = 2.3 K). The observed anisotropy is more elucidated in ρ-H measurements performed below at different tilt angles. The anisotropy parameter is found to be 1.26. The observed results show the presence of a two-fold anisotropic superconducting state in the Sn4Au single crystal, which may be induced due to the layered structure of the synthesized Sn4Au single crystal.