平衡SQUID临界电流的抑制
Suppression of the critical current of a balanced SQUID
摘要：
本文对三个约瑟夫森结并联的平衡SQUID的临界电流与磁通量的关系进行了实验研究。与普通直流SQUID不同，临界电流的抑制不依赖于约瑟夫森结的确切参数。抑制基本上仅受SQUID回路的电感限制。我们证明了一个临界电流抑制比高于300的平衡SQUID的最大临界电流30 nA。
英文摘要：
We present an experimental study of the magnetic flux dependence of the critical current of a balanced SQUID with three Josephson junctions in parallel. Unlike for ordinary dc SQUIDs, the suppression of the critical current does not depend on the exact parameters of the Josephson junctions. The suppression is essentially limited only by the inductances of the SQUID loops. We demonstrate a critical current suppression ratio of higher than 300 in a balanced SQUID with a maximum critical current 30 nA.
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