MODULATION OF LOW-FREQUENCY SHAPIRO STEPS OF SUPERCONDUCTING PROXIMITY-EFFECT JUNCTIONS

被引:9
作者
HEBBOUL, SE
HARRIS, DC
GARLAND, JC
机构
[1] Department of Physics, Ohio State University, Columbus, Ohio
来源
PHYSICA B | 1990年 / 165卷
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0921-4526(09)80400-6
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We observe a modulation of Shapiro step heights in superconducting Nb-Au-Nb (SNS) Josephson junctions at an rf frequency v = 20 MHz (hv/2eRIc ≈ 0.17). In addition to the expected steps at Vn = nhv/2e, n = 0,1,2,etc., we record an odd sequence of steps at an rf current amplitude Irf/Ic ≈ 3.81, and an even sequence of steps at Irf/Ic ≈ 3.96. For Irf/Ic ≈ 2.22, both even and odd steps are present after the 4th step. The measured rf power and frequency dependences of the step heights are in excellent agreement with the Resistively-Shunted Junction (RSJ) model predictions. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.
引用
收藏
页码:1629 / 1630
页数:2
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