Zhang Enze, Xu Xian, Huang Ce, Zou Yi-Chao, Ai Linfeng, Liu Shanshan, Leng Pengliang, Jia Zehao, Zhang Yuda, Zhao Minhao, Li Zihan, Yang Yunkun, Liu Jinyu, Haigh Sarah J, Mao Zhiqiang, Xiu Faxian
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China.
Nano Lett. 2021 Jan 13;21(1):288-297. doi: 10.1021/acs.nanolett.0c03655. Epub 2020 Dec 21.
The motion of Abrikosov vortices is the dominant origin of dissipation in type II superconductors subjected to a magnetic field, which leads to a finite electrical resistance. It is generally believed that the increase in the magnetic field results in the aggravation of energy dissipation through the increase in vortex density. Here, we show a distinctive re-entrance of the dissipationless state in quasi-one-dimensional superconducting TaPdS nanostrips. Utilizing magnetotransport measurements, we unveil a prominent magnetoresistance drop with the increase in the magnetic field below the superconducting transition temperature, manifesting itself as a giant re-entrance to the superconducting phase. Time-dependent Ginzburg-Landau calculations show that this is originated from the suppression of the vortex motion by the increased energy barrier on the edges. Interestingly, both our experiments and simulations demonstrate that this giant re-entrance of superconductivity occurs only in certain geometrical regimes because of the finite size of the vortex.
阿布里科索夫涡旋的运动是处于磁场中的II型超导体中耗散的主要来源，这导致了有限的电阻。人们普遍认为，磁场的增加会通过涡旋密度的增加导致能量耗散加剧。在此，我们展示了准一维超导TaPdS纳米带中无耗散状态的独特再进入现象。利用磁输运测量，我们揭示了在超导转变温度以下，随着磁场增加出现显著的磁阻下降，表现为向超导相的巨大再进入。含时金兹堡 - 朗道计算表明，这源于边缘处能量势垒增加对涡旋运动的抑制。有趣的是，我们的实验和模拟均表明，由于涡旋的有限尺寸，这种超导的巨大再进入仅在特定几何区域中出现。
