2025/07/19 by Wang, Yang, Tan, Pengjian, Chi, Mingxi +4
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2507.14540
We investigate the anisotropic flux dynamics in 2H-NbS2 single crystals through temperature-dependent resistance measurements under in-plane (H ∥ ab plane) and out-of-plane (H ⊥ ab plane) magnetic fields. Analysis of thermally activated flux flow (TAFF) resistance in the superconducting mixed state reveals stark contrasts in thermal activation energy (U0) scaling and field dependence. For H ⊥ ab, U0(0.1 T) = (1228.76 ± 53.64) K follows the Arrhenius relation with a power-law field decay (U0∝ H-α). In contrast, under H ∥ ab, U0(0.5 T) = (7205.58 ± 619.65) K aligns with the modified TAFF theory, where the scaling exponent q = 2 potentially reflects two-dimensional vortex behavior in the TAFF region, and the field dependence of U0 follows parabolic relation Hγ[1 - \fracHH*]2. These results establish 2H-NbS2 as a model system for probing the anisotropy of flux dynamics in layered superconductors.