Coexisting multiple dynamic states generated by magnetic field in Bi2Sr2CaCu2O8+ stacked Josephson junctionsYong-Duk Jin1, Hu-Jong Lee1, A. E. Koshelev2, Gil-Ho Lee1 and Myung-Ho Bae3
1 Department of Physics, Pohang University of Science and Technology - Pohang 790-784, Korea
2 Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
3 Department of Electrical and Computer Engineering, Micro and Natotechnology Laboratory, University of Illinois at Urbana-Champaign - IL 61801, USA
received 4 August 2009; accepted in final form 9 October 2009; published October 2009
published online 9 November 2009
Josephson vortices in naturally stacked Bi2Sr2CaCu2O8+ tunneling junctions display rich dynamic behavior that derives from the coexistence of three basic states: static Josephson vortex lattice, coherently moving lattice, and incoherent quasiparticle tunneling state. The rich structure of hysteretic branches observed in the current-voltage characteristics can be understood as combinatorial combinations of these three states which are realized in different junctions and evolve separately with magnetic field and bias current. In particular, the multiple Josephson vortex flow branches at low-bias currents arise from the individual depinning of Josephson vortex rows in each junction.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.50.+r - Tunneling phenomena; point contacts, weak links, Josephson effects.
74.72.Hs - Bi-based cuprates.
© EPLA 2009