Abstract
We investigated numerically IV-characteristics and power of emission from stacks with various quantities of long Josephson junctions (up to 6 junctions) which interacted inductively with each other. Parameters of junctions were chosen close to those for MoRe-Si(W)-MoRe heterostructures. We set Gaussian spread of about 0.01% of critical currents along junctions. Electrical properties of a stack consisted of three junctions was investigated in details. Zero-fi eld steps at voltages corresponding to frequencies of various modes of electromagnetic waves in the stack were found in the IV-characteristic. We showed that positions of zero-fi eld steps in IV-curves were in good agreement with predictions of the theory. The highest maximum of power of emission corresponded to the so-called in-phase mode at which all voltages over junctions in the stack oscillate in-phase. Considering stacks with many junctions, we showed that power of emission at the voltage of the resonance which corresponds to the in-phase mode is proportional to the square of quantity of long junctions in the stack that is the characteristic of coherent emission.
Highlights
The huge progress was made in the creation of sources of coherent emission made of many intrinsic Josephson junctions on the base of high-temperature superconductors [1,2,3]
Zero-field steps are close related to Fiske steps which appear at voltages which correspond to frequencies of geometrical resonances in the system when the Josephson junction is placed in some magnetic field [6, 7]
If the distribution of critical currents is inhomogeneous and symmetrical, zero-field steps appear at voltages Vp that correspond to even geometrical resonances: Vp where 0 is the quantum of magnetic flux, c is the velocity of light in the junction, D is the size of the junction and p=1,2... is integer
Summary
The huge progress was made in the creation of sources of coherent emission made of many intrinsic Josephson junctions on the base of high-temperature superconductors [1,2,3]. Сходинки нульового поля при напругах, які відповідали частотам різних мод електромагнітних хвиль в пачці були знайдені на вольт - амперній характеристиці. Ступеньки нулевого поля при напряжениях, соответствующих частотам различных мод электромагнитных волн в пачке, были найдены на вольт - амперной характеристике.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
