AI Article Synopsis
- The Superconductor-insulator transition (SIT) in one-dimensional nanowires has been a hot topic, with differing results based on wire morphology, and Nb2PdS5 is a notable low-dimensional superconductor to study.
- By reducing the diameter of Nb2PdS5 nanowires to 100-300 nm, a clear SIT was observed, influenced by both the wire's cross-sectional area and external magnetic fields.
- The study revealed that as the wire diameter decreases, the upper critical magnetic field drops and resistance behavior below the critical temperature aligns with thermally activated phase slip theory, indicating strong Coulomb interactions at play.
Article Abstract
Superconductor-insulator transition (SIT) in one-dimensional (1D) nanowires attracts great attention in the past decade and remains an open question since contrasting results were reported in nanowires with different morphologies (i.e., granular, polycrystalline, or amorphous) or environments. Nb2PdS5 is a recently discovered low-dimensional superconductor with typical quasi-1D chain structure. By decreasing the wire diameter in the range of 100-300 nm, we observed a clear SIT with a 1D transport character driven by both the cross-sectional area and external magnetic field. We also found that the upper critical magnetic field (Hc2) decreases with the reduction of nanowire cross-sectional area. The temperature dependence of the resistance below Tc can be described by the thermally activated phase slip (TAPS) theory without any signature of quantum phase slips (QPS). These findings demonstrated that the enhanced Coulomb interactions with the shrinkage of the wire diameter competes with the interchain Josephson-like coupling may play a crucial role on the SIT in quasi-1D system.
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