Intrinsic superconducting transport properties of ultra-thin Fe1+yTe0.6Se0.4 microbridges

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2017,（11）
• 页码范围: 76-80
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11433-017-9082-1

摘要

We investigated the superconducting properties of Fe1+yTe0.6Se0.4 single-crystalline microbridges with a width of 4 μm and thicknesses ranging from 20.8 to 136.2 nm.The temperature-dependent in-plane resistance of the bridges exhibited a type of metalinsulator transition in the normal state.The critical current density (Jc) of the microbridge with a thickness of 136.2 nm was 82.3 kA/cm2 at 3 K and reached 105 kA/cm2 after extrapolation to T =0 K.The current versus voltage characteristics of the microbridges showed a Josephson-like behavior with an obvious hysteresis.These results demonstrate the potential application of ultra-thin Fe-based microbridges in superconducting electronic devices such as bolometric detectors.