The physical properties of superconducting nanpwires

• Main Authors: Chu Hsien-Yao, 朱賢耀
• Other Authors: Ching-Lin Chang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/66341031614834015962

碩士 === 淡江大學 === 物理學系碩士班 === 95 === Porous anodic aluminum oxide (AAO) films were synthesized from high purity (99.995%) aluminum foils. Different pore sizes were obtained by adjusting applied voltage and reaction time. The products were then used as templates for fabricating indium nanowires of 30, 60 and 200 nm in diameter by chemical electro-deposition method. Magnetic and electrical properties of the superconductor indium nanowires were measured using a superconducting quantum interference device magnetometer and a physical properties measurement system. Experimental results show different electrical resistivity behavior in one-dimensional nanowires from that of bulk indium. Unexpected resistivity increase with decreasing temperature prevails below the superconducting transition temperature Tc in 60 and 200 nm, but not in 30-nm wire. Similar results have been reported by Zgirski et al. and by Vodolazov et al. Just as surprising is the observation in the 30-nm but not 60- and 200-nm wire that, below Tc and between approximately 500 and 1500 μA for, a non-zero voltage decreases with increasing current. The origins of these results are yet to be identified.