Superconductor鈥揑nsulator Transition in Quasi-One-Dimensional Single-Crystal Nb2PdS5 Nanowires

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• 作者：Wei Ning ; Hongyan Yu ; Yequn Liu ; Yuyan Han ; Ning Wang ; Jiyong Yang ; Haifeng Du ; Changjin Zhang ; Zhiqiang Mao ; Ying Liu ; Mingliang Tian ; Yuheng Zhang
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：February 11, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：869-875
• 全文大小：431K
• ISSN：1530-6992

文摘

Superconductor鈥搃nsulator 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鈥?00 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 (H_c2) decreases with the reduction of nanowire cross-sectional area. The temperature dependence of the resistance below T_c 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.