2008/02/20 by Maayan Moshe, V. G. Kogan, R. G. Mint︠s︡ +1 · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Enhanced Data Rates for GSM Evolution #Equidistant #Geometry #Iron-based superconductors research #Josephson effect #Magnetic field #Mathematics #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Squid #Superconductivity #Type (biology) #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.020510
4 pages, 4 figures
arxiv created 2008/02/20 · openalex publication_date 2008/07/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the field dependence of the maximum current Im(H) in narrow edge-type thin-film Josephson junctions. We calculate Im(H) within nonlocal Josephson electrodynamics taking into account the stray fields. These fields affect the difference of phases of the order parameter across the junction and therefore the tunneling currents. We find that the phase difference along the junction is proportional to the applied field, depends on the junction geometry, but is independent of the Josephson critical current density, i.e., it is universal. An explicit formula for this universal function is derived and used to calculate Im(H). It is shown that the maxima of Im(H)\ensuremath∝1/√(H) and the zeros of Im(H) are equidistant only in high fields. We find that the spacing between the zeros is proportional to 1/w2, where w is the width of the junction. The general approach is applied to calculate Im(H) for a superconducting quantum interference device (SQUID) with two narrow edge-type junctions.