2004/11/23 by A. A. Abdumalikov Jr, A. A. Abdumalikov, V. V. Kurin +11
Engineering · Physics and Astronomy · #FOS: Physical sciences #Magneto-Optical Properties and Applications #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0411573
Submitted to Phys. Rev. B
arxiv created 2004/11/23 · openalex publication_date 2004/11/23 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
We experimentally and theoretically investigate electromagnetic cavity modes in ultra-narrow Al-AlOx-Al and Nb-AlOx-Nb long Josephson junctions. Experiments show that the voltage spacing between the Fiske steps on the current-voltage characteristics of sub-μm wide and several hundred μm long Al-AlOx-Al and Nb-AlOx-Nb Josephson junctions increases when decreasing the width of a junction. This effect is explained by stray magnetic fields, which become important for narrow junctions. Theoretical estimates of the Fiske step voltage based on a nonlocal wave propagation equation are in good agreement with our experimental data. Using the nonlocal model, we determine the size and mass of a Josephson vortex by means of a variational approach, and relate vortex size to the experimentally measured critical magnetic field of the junction.