Periodic Oscillations of Josephson-Vortex Flow Voltage in Stacked Intrinsic Josephson Junctions

Abstract

Using the coupled sine-Gordon equations, we study the magnetic oscillation behavior of the Josephson-vortex flow voltage (JVFV) in stacked intrinsic Josephson junctions (IJJs). It is found that the periodic oscillations of the JVFV with the magnetic field are determined by the lattice structure. In narrow IJJs with a high density of vortices, the boundary interaction is favorable for forming a rectangular lattice structure and inducing H0 oscillations. The oscillation period is equal to the magnitude of the field needed to add one vortex quantum per one intrinsic Josephson junction. In wide IJJs, the shearing inter-layered interaction is favorable for forming a triangular lattice structure and inducing H0/2 oscillations. In this case, with increasing magnetic field, a transformation from the triangular (with period H0/2) to rectangular (with period H0) configurations is also obtained in a long lateral size. Besides, from the magnetic oscillation characteristics of the JVFV in wide IJJs, the oscillating inversions have also been obtained.