A theoretical study of the current‐phase relation in Josephson contacts
A theoretical study of the current‐phase relation in Josephson contacts
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DOI：
10.1002/pssa.2210470266
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发表时间：
1978-06
期刊：
影响因子：
--
通讯作者：
W. Haberkorn;H. Knauer;J. Richter
中科院分区：
文献类型：
--
作者：
W. Haberkorn;H. Knauer;J. Richter
使用高分辨率测量技术，Jackel等人/ 1/最近发现，许多超导弱连接可能具有明显的非正弦电流相位关系（CPR）。在通常使用的点接触的情况下，CPR预期为从正弦到极非正弦的任何值，其最大值在相位%/2 <$p <%/2/。虽然分析弱链路实验的大多数方法都是基于正弦CPR，但例如rf SQUID系统噪声分析的实验结果表明，对于具有非正弦CPR的SQUID环，最小可达到噪声显著高于具有正弦关系/3/的环。此外，这种偏离简单的约瑟夫森CPR预计将有明显的影响，所有设备的工作特性，包括薄弱环节。
Using a high-resolution measuring technique Jackel et al./1/recently found that many superconducting weak links may have markedly non-sinusoidal currentphase relations (CPR). In the case of commonly used point contacts the CPR is expected to be anywhere from sinusoidal to extremely non-sinusoidal with its maximum at phases%/2<'p<%/2/. While most approaches in analyzing weak-link experiments are based on a sinusoidal CPR, experimental results of a rf SQUID system noise analysis for instance show that, for a SQUID ring having a non-sinusoidal CPR the minimum attainable noise is considerably higher than it is for a ring with a sinusoidal relation/3/. Furthermore, such departures from the simple Josephson CPR are expected to have pronounced effects on the operating characteristic of all devices incorporating weak links.