Critical field for complete vortex expulsion from narrow superconducting strips
Critical field for complete vortex expulsion from narrow superconducting strips
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DOI：
10.1103/physrevlett.92.097003
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发表时间：
2004-03-05
影响因子：
8.6
通讯作者：
Martinis, JM
中科院分区：
文献类型：
--
作者：
Stan, G;Field, SB;Martinis, JM
我们已经测量了涡旋完全从薄膜超导带材中排出的最大场。将宽度为W的铌条进行场冷却，并用扫描霍尔探针显微镜成像。在临界磁场B（m）以下，所有的通量都被排出，在此磁场以上，观察到密度随磁场近似线性增加的涡旋。临界场的值很小，比体中的小几个数量级，这意味着超导装置应该设计成具有窄导线，以消除涡流运动产生的噪声。
We have measured the maximum field for which vortices are completely expelled from a thin-film superconducting strip. Niobium strips of width W were field cooled and imaged with a scanning Hall-probe microscope. Below a critical field B(m)approximate toPhi(0)/W-2 all flux was expelled; above this field vortices were observed with a density increasing approximately linearly with field. The small value of the critical field, which is orders of magnitude less than in the bulk, implies that superconducting devices should be designed with narrow wires to eliminate the generation of noise from vortex motion.