Geometry dependence of nonlinear effects in high temperature superconducting transmission lines at microwave frequencies

被引:44
作者
Booth, JC [1 ]
Beall, JA [1 ]
Rudman, DA [1 ]
Vale, LR [1 ]
Ono, RH [1 ]
机构
[1] Natl Inst Stand & Technol, Boulder, CO 80303 USA
关键词
D O I
10.1063/1.370841
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigate the nature of low-power nonlinear effects in high-temperature superconducting microwave devices by measuring third harmonic generation at 76 K in coplanar waveguide transmission lines of different geometries fabricated from YBa2Cu3O7-delta thin films. The measured power in the third-harmonic signal changes systematically with film thickness, center conductor linewidth, and line length. We analyze these results using a simple model for a transmission line with a nonlinear inductance arising from a current-dependent superconducting penetration depth. This analysis describes quantitatively the observed differences in harmonic generation for transmission lines of different dimensions, and yields a single geometry-independent parameter (the nonlinear scaling current density J(0)) to quantify the observed nonlinear behavior. For the thin film samples studied here J(0)=3.0x10(7) A/cm(2) at 76 K for all geometries investigated. These results provide the means to establish a lower limit for the expected nonlinear response of superconducting components of arbitrary geometry at microwave frequencies. (C) 1999 American Institute of Physics. [S0021-8979(99)05614-5].
引用
收藏
页码:1020 / 1027
页数:8
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