王林
,
许伟伟
,
翟计全
,
李晓虎
,
孙国柱
,
吴培亨
低温物理学报
超导约瑟夫森结是超导量子比特的核心元件,由约瑟夫森结组成的直流超导量子干涉器(DC-SQUID)由于其具有较高的探磁灵敏度,在超导磁通量子比特量子位测量中具有重要的作用.我们用铝为超导材料,采用电子柬斜蒸发及静态氧化的方法制备了由两个Al/Al2O3/Al隧道结并联组成的DC-SQUID样品.将DC-SQUID样品置于20～1000mK范围内的不同温度下,对其跳变电流分布进行了测量.在50mK明显观测到了隧道结跳变电流机制由宏观量子隧穿到热激发的转变,并且在高于80mK时,观测到了相位扩散的现象.这对于隧道结相位动力学研究具有重要意义.
关键词:
跳变电流分布
,
宏观量子隧穿
,
热激发
,
相位扩散
R.Shi
,
G.X.Hu
,
H.J.Li and M.K.Kang (The State Education Commission Open Research Laboratory for High Temperature Materials and Testing
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China)(Department of Materials Science and Engineering
,
Northwestern Polytechnical University
,
Xi'an 710072
,
China)
金属学报(英文版)
The steady-state creep behavior of unidirectional C/C(1-D-C/C) composite with pyrolytic carbon matrix was investigated at high temperatures up to 2160℃ and under tensile stress from 133.83 to 213.46MPa. Based on the creep experiment of single specimen method, the apparent activation energy and the stress exponent for steadystate creep were determined by the use of a self-made apparatus and an auto-testing system. Value of apparent activation volume is provided and the creep mechanism has also been discussed.
关键词:
1-D-C/C
,
null
,
null
