Enhanced Superconductivity and Vortex Dynamics in One-Dimensional TaS2 Nanowires

TL;DR

This study synthesizes high-quality 1D TaS2 nanowires exhibiting enhanced superconductivity with higher transition temperatures and critical fields, revealing complex vortex dynamics and potential for quantum applications.

Contribution

The paper introduces a novel two-step synthesis method for TaS2 nanowires with improved superconducting properties and detailed analysis of vortex behavior in reduced dimensions.

Findings

Superconducting transition temperature increased to ~3.6 K

Critical magnetic field exceeded bulk values (~5 T)

Observed complex vortex dynamics including flux jumps

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 1D morphology, while magnetotransport measurements reveal an enhanced upper critical field {\mu}oHc2 (2 K) ~ 5 T, far exceeding the bulk value ({\mu}oHc2 (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.