nn9b09026_si_001.pdf (545.71 kB)
Anomalous Negative Resistance Phenomena in Twisted Superconducting Nanowire Yarns
journal contribution
posted on 2020-02-25, 14:41 authored by Jeong-Gyun Kim, Sung Ju Hong, Haeyong Kang, Dongseok SuhWe
report unusual absolute negative resistance phenomena in twisted
superconducting yarns consisting of niobium-nitride (NbN) nanowires
formed on a template of aligned carbon nanotube (CNT) sheets. In the
vicinity of the superconducting critical temperature and critical
current, the electrical resistance with a standard four-probe configuration
exhibits negative values for many wire-shaped twisted yarns. This
anomalous behavior at the superconducting transition stage is analyzed
using a simplified circuit model, where the charge conduction is determined
by the combination between the intra- and internanofiber transports
inside the yarn. The superconducting transition of intrafibrillar
transport along CNT-templated NbN nanowires was distinguished from
that of an interfibrillar one, where the latter exhibits the ensemble
property of superconducting weak links among adjacent NbN nanowires.
Furthermore, the topological similarity between the sheet of an aligned
array of nanowires and the yarn of twisted nanofibrils enables the
occurrence of this anomaly. This study indicates that the quantitative
network-based approach is effective for the analysis of anomalous
charge conduction through nanowire-based anisotropic materials.