Periodic Oscillations of Josephson-Vortex Flow Resistance in Oxygen-Deficient Y1Ba2Cu3Ox

TL;DR

This study investigates the periodic oscillations in Josephson vortex flow resistance in oxygen-deficient YBa2Cu3Ox junctions, revealing lattice formation behaviors at high magnetic fields in highly anisotropic superconductors.

Contribution

It demonstrates the observation of periodic oscillations in Josephson vortex flow resistance in oxygen-reduced YBa2Cu3Ox, linking these oscillations to vortex lattice formation in highly anisotropic materials.

Findings

Periodic oscillations observed above 45-58 kOe

Oscillation period matches fluxon addition per two junctions

Triangular vortex lattice formation inferred at high fields

Abstract

We measured the Josephson vortex flow resistance as a function of magnetic field applied parallel to the ab-planes using annealed Y1Ba2Cu3Ox intrinsic Josephson junctions having high anisotropy (around 40) by oxygen content reduction. Periodic oscillations were observed in magnetic fields above 45-58 kOe, corresponding to dense-dilute boundary for Josephson vortex lattice. The observed period of oscillations, agrees well with the increase of one fluxon per two junctions ($H_{p}$\textit{=$\Phi $}$_{0}$\textit{/2Ls}), may correspond to formation of a triangular lattice of Josephson vortices as has been reported by Ooi et al. for highly anisotropic (larger than 200) Bi-2212 intrinsic Josephson junctions.