Enhanced superconductivity and vortex dynamics in quasi-1D TaS2 nanowires

Abstract

We report the synthesis of high-quality 2H-TaS2 nanowires via a controlled two-step conversion process from TaS3 precursors, achieving robust superconductivity with a transition temperature Tc ≈ 3.6 K, which is significantly higher than bulk 2H-TaS2 (Tc ≈ 0.8 K). Structural and compositional analyses confirm phase purity and preserved one-dimensional morphology, while magnetotransport measurements reveal an enhanced upper critical field μ0Hc2 (2 K) ≈ 5 T, far exceeding the bulk value (μ0Hc2 (0) ≈ 1.17 T), attributed to dimensional confinement and suppression of charge-density wave order. Magnetic characterization demonstrates complex vortex dynamics, including flux jumps and a second magnetization peak, indicative of strong pinning and crossover from elastic to plastic vortex regimes. These findings establish TaS2 nanowires as a versatile platform for studying superconductivity in reduced dimensions and exploiting confinement-driven quantum phenomena for advanced applications.