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We carry out experimental and theoretical investigations into the effect of the vortex chain propagation on the current-voltage characteristics of YBa 2 Cu 3 O 7−δ (YBCO) long Josephson junctions. Samples of YBCO Josephson junctions, fabricated on 24°[001]-tilt bicrystal substrates, have been measured. The improved technology has allowed us to observe and study the asymmetry of the current-voltage characteristics with opposite magnetic fields (Revin et al 2012 J. Appl. Phys. 114 243903), which we believe occurs due to anisotropy of bicrystal substrates (Kupriyanov et al (2013 JETP Lett. 95 289)). Specifically, we examine the flux-flow resonant steps versus the external magnetic field, and study the differential resistance and its relation to oscillation power for opposite directions of vortex propagation.

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