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中国物理学会期刊

圆对称环域Josephson隧道结的静态特性(Ⅰ)——准衍射现象和自场效应

CSTR: 32037.14.aps.37.705

STATIC CHARACTERISTICS OF CIRCULAR SYMMETRIC ANNULAR JOSEPHSON JUNCTION (Ⅰ)——THE QUASI-DIFFRACTION CHARACTERISTIC AND THE SELF-FIELD EFFECTS

CSTR: 32037.14.aps.37.705
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  • 本文研究了圆对称环域Josephson隧道结的静态特性。在环带宽度较窄的情形下,不计入自场,并考虑到外磁场在结区内的非均匀性,解析地得到了lm与外磁场的lH的关系。与典型的小结衍射图形所不同的是所有极小都不为零,表现出准衍射图形特征。在环带宽度较宽的情形下,对自场方程进行了数值计算,得到其与一般一维结不同的结特性。

     

    The static Josephson effects in the circular symmetric annular junctions are discussed in this paper. When the annular widths are smaller than λJ, analytic solutions of magnetic field dependence of the maximum Josephson current Im, are obtained. Because the external magnetic field is nonuniform distributed in the junctions, the minima of lm are not equal to zero. These results exhibit a quasi-diffraction characteristic. When the annular widths are larger than λJ, the numerical solutions of the self-field equations are obtained, which show the magnetic field dependence of the maximun Josephson current Im and the current distribution. Due to the 2-dimensional character, the points of maximum of Im are not on the axis where the external field is equal to zero in the plot of Im vs. IH.

     

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