Evidence for Nonlocal Electrodynamics in Planar Josephson Junctions
Evidence for Nonlocal Electrodynamics in Planar Josephson Junctions
We study the temperature dependence of the critical current modulation ${I}_{\mathrm{c}}(H)$ for two types of planar Josephson junctions: a low-${T}_{\mathrm{c}}$ $\mathrm{Nb}/\mathrm{CuNi}/\mathrm{Nb}$ and a high-${T}_{\mathrm{c}}$ ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ bicrystal grain-boundary junction. At low $T$ both junctions exhibit a conventional behavior, described by the local sine-Gordon equation. However, at elevated $T$ the behavior becomes …