Current Distribution in Y-Ba-Cu-O Superconducting Microbridges Containing Π-Shaped Channel for Easy Vortex Motion

J. Sulcasa, L. Steponavicieneb, A. Juknab, G. Jungc, V. Plausinaitiened, A. Abrutisd, M. Gonge and R. Sobolewskie aJoint Stock Company "Etronika", LT-09132 Vilnius, Lithuania bDepartment of Physics, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania cDepartment of Physics, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel dDepartment of General and Inorganic Chemistry, Vilnius University, LT-03225 Vilnius, Lithuania eDepartment of Electrical and Computer Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231, USA

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A mixed state in dc-biased thin films of II-type superconductors realizes the Abrikosov magnetic vortices/antivortices, which are the result of the current-self magnetic field penetration into the film at temperatures lower than its critical temperature Tc. A nucleation of vortices/antivortices at the superconducting film's edges, their motion perpendicular to the direction of biasing current, and the annihilation in the film's center originates from a current dissipation in the superconductor and expresses itself in experiments as a dc voltage. This work reports on the results of simulation of current density in a 50 μm wide, 100 μm long, and 0.3 μm thick YBa2Cu3O7 - x microbridges containing Π-shaped 5 μm wide single channel of easy vortex motion fabricated by means of laser-writing technique. Analyzing a two-dimensional-net of resistors and assuming that, due to the Meissner-Ochsenfeld effect, the magnetic flux penetration into superconducting film is nonlinear, we demonstrate that presence of a Π-shaped channel causes a non-homogeneous distribution of current in the microbridge.

DOI: 10.12693/APhysPolA.119.183 PACS numbers: 74.78.-w, 74.25.Sv, 74.25.F-, 74.25.Wx