Simulation of the Effect of Temperature on Flux-Flow Behavior in Stacked Intrinsic Josephson Junctions

• Published in: IEEE transactions on applied superconductivity Vol. 19; no. 3; pp. 730 - 733
• Main Authors: Irie, A., Oya, G.-i.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Computer simulation; Current-voltage characteristics; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Fluctuation; Fluctuations; Fluid flow; flux flow; Frequency; intrinsic Josephson junctions; Josephson junctions; Lattice vibration; Lattices; Lorentz force; Magnetic fields; Magnetic noise; Mathematical models; Oscillators; Plasma temperature; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Simulation; Studies; Superconducting devices; Thermal force; Various equipment and components; {\rm Bi}_{2}{\rm Sr}_{2}{\rm CaCu}_{2}{\rm O}_{y}; External field; Flux flow; C; Voltage current curve; Phase fluctuation; Swirling flow; Josephson junction; Bi; O; Cu; Cavity; intrinsic Josephson junctions; System simulation; Thermal noise; Inductive coupling; Lorentz force; Magnetic field; High temperature superconductor; Sr
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2009.2019230

We have numerically studied the effect of temperature on the flux-flow behavior in a stack of intrinsic Josephson junctions by using the inductive coupling Josephson junctions model taking into account thermal fluctuations. In the absence of noise, the current-voltage characteristic shows a series of clear Fiske and flux-flow steps depending on an external magnetic field. With increasing temperature the Fiske steps corresponding to the out-of-phase mode remain on the current-voltage characteristic but other steps disappear. This suggests that the out-of-phase cavity mode becomes more stable than other modes due to the fluctuations. Furthermore, it is found that the in-phase flux flow mode is also strongly affected by the thermal noise in contrast to the out-of-phase one and fluctuations disturb the formation of the rectangular lattice of vortices even in the flux-flow mode driven by a strong Lorentz force Our results can qualitatively explain recent experimental observations in intrinsic Josephson junctions in the flux-flow state.