Possible existence of field‐induced Josephson junctions
Possible existence of field‐induced Josephson junctions
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可能存在场诱导约瑟夫森结
DOI：
10.1002/pssb.201100002
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Prokopow
中科院分区：
文献类型：
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作者：
K. Pomorski;P. Prokopow
我们证明了一类新的超导约瑟夫森结(JJ)的可能存在，即场诱导约瑟夫森结(FIJJ)。一个有代表性的例子是在超导带的顶部放置一个铁磁条形成的结点，我们在这项工作中对其进行了研究。我们得到了FIJJ的一个区域(在某些方面类似于S-F-S约瑟夫森结，但边界条件不同)和第二个区域(FIJJ的第二个区域是弱连接收缩(两个超导体由一个窄的超导链接连接)与超导带厚度、磁化强度和温度的函数)之间可能的转变。我们利用推广的Hubbard模型得到的广义Ginzburg-Landau(GL)方程来确定这类新的Josephson结的一些性质。在这篇文章中，我们对第一类超导体进行了计算，尽管这两种类型的超导体都可以用来创建FIJJ。并对这类约瑟夫森结的进一步研究方向进行了描述。
We demonstrate the possible existence of a new class of superconducting Josephson junctions (JJs) named field‐induced Josephson junctions (FIJJs). One representative is a junction made by placing a ferromagnetic strip on the top of a superconducting strip, which we study in this work. We obtain a possible transition between one regime of an FIJJ, which is the quasi‐tunneling weak link Josephson junction (similar in certain aspects to an S–F–S Josephson junction, but with different boundary conditions), and the second regime of an FIJJ, which is the weak link constriction (two superconductors connected by a narrow superconducting link) as a function of the thickness of the superconducting strip, magnitude of magnetization, and temperature. We use the generalized Ginzburg–Landau (GL) equations derived from the extended Hubbard model in order to determine some properties of the new class of Josephson junction. In this paper, we perform the computation for a first type of superconductor, although both types of superconductor can be used to create an FIJJ. Further directions of studies of the indicated class of Josephson junction are also described.