Modulation of low—frequency shapiro steps of superconducting proximity-effect junctions

✍ Scribed by S.E. Hebboul; D.C. Harris; J.C. Garland

• Book ID: 104356489
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 301 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80400-6

✦ Synopsis

We observe a modulation of Shapiro step heights in superconducting Nb-Au-Nb (SNS) Josephson junctions at an rf frequency v = 20 MHz (hv/2eRI c '" 0.17). In addition to the expected steps at V o = nhv/2e, n = 0,1,2,etc., we record an odd sequence of steps at an rf current amplitude IjIc '" 3.81, and an even sequence of steps at IrIle '" 3.96. For IA '" 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.