Home
| VOLUME 102 (2015) | ISSUE 12 | PAGE 919 |
|---|
|
Staircase structure of Shapiro steps1)
Yu. M. Shukrinov+* 2), I. R. Rahmonov+×, M. Nashaat+°
+Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia *Dubna International University for Nature, Society and Man, 141982 Dubna, Russia ×Umarov Physical and Technical Institute, 734063 Dushanbe, Tajikistan °Department of Physics, Cairo University, 12613 Cairo, Egypt
Abstract
We investigate IV-characteristics of coupled Josephson junctions which model the intrinsic Josephson junctions in high temperature superconductors under external electromagnetic radiation. A staircase structure of Shapiro steps is found in the branching region. Its origin is related to the coupling between junctions and their switching from rotating to oscillating states. This conclusion are tested by detailed analysis of the IV-characteristics as for total stack and for each junction in the stack. IV-curves of junctions in the stack are compared with the average of time derivative of phase difference. Experimental observation of this staircase structure would give us a prove of coupling between junctions and a way for precise measurement of its value. Such investigations would be also useful for a diagnostic of Josephson junctions in the stack. |