Properties of YBaCuO nanobridges and dc-SQUIDs
Properties of YBaCuO nanobridges and dc-SQUIDs
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YBaCuO 纳米桥和 dc-SQUID 的特性
DOI：
10.1109/77.621810
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发表时间：
1997
影响因子：
1.8
通讯作者：
H. Rogalla
中科院分区：
文献类型：
--
作者：
M. Pedyash;D. Blank;J.H. de Muijnck;H. Rogalla
YBaCuO 纳米桥和感应分流 dc-SQUID 已通过直接聚焦离子束铣削进行图案化。纳米桥表现出真正的约瑟夫森效应，这可以通过桥中阿布里科索夫涡旋的相干运动来解释。这种效应的增强被认为是由于纳米桥区域内超导特性的局部抑制。随着温度的降低，这导致纳米桥从 SNS 型行为转变为 SS'S 型行为。讨论了临界电流、动态电阻和 SQUID 电压通量调制的温度依赖性。在 62.7 K 下测量 nanoSQUID 的通量噪声水平约为 6.5 /spl mu//spl Phi//sub 0///spl radic/Hz。
YBaCuO nanobridges and inductively shunted dc-SQUIDs have been patterned by direct Focused Ion Beam milling. Nanobridges manifest true Josephson effect, which can be explained by coherent motion of Abrikosov vortices in the bridge. An enhancement of this effect is proposed to be due to local suppression of the superconducting properties within the nanobridge area. This leads to a transition from SNS to SS'S type behavior of the nanobridge with decreasing temperature. Temperature dependence of the critical current, dynamic resistance, and SQUID voltage-flux modulation is discussed. The flux noise level of the nanoSQUID is measured to be about 6.5 /spl mu//spl Phi//sub 0///spl radic/Hz at 62.7 K.