Investigation Details of Vortex Density in Laser-Written Π-Shaped Channel of YBCO Bridge by Means of I-V Dependences |
| L. Steponavicienea, J. Sulcasb, A. Juknaa, G. Jungc, V. Plausinaitiened, A. Abrutisd, A. Maneikise, M. Gongf and R. Sobolewskif
aDepartment of Physics, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania bJoint Stock Company "Etronika", LT-09132 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 eHigh-Tc Superconductivity Laboratory, Centre for Physical Sciences and Technology, LT-02300 Vilnius, Lithuania fDepartment of Electrical and Computer Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231, USA |
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| A current-self-induced magnetic field Hj, such that Hc1 < Hj < Hc2 at T < Tc, penetrates a thin-film, type-II superconductor forming the Abrikosov magnetic vortex-antivortex pairs in the film's areas of weakest superconductivity. Our atomic force microscopy and scanning tunneling microscopy images confirm that in 50 μm wide, 100 μm long and 0.3 μm thick YBa2Cu3O7 - x superconducting devices magnetic flux penetrates first into a 5 μm wide, Π-shaped and partially deoxygenated (x ≈ 0.2) channel for easy vortex motion. When the Lorentz force overcomes pinning force in the channel, the flux starts to move and its drift dissipates energy inducing dc voltage. This work reports on the density of coherently moving vortices along the channel vs. temperature in range from 0.93Tc to 0.97Tc. Our simulations show that the vortex density vs. temperature dependence extracted from I-V measurements of our devices follows the temperature dependence of magnetic field penetration depth and the coherence length of the superconductor. |
| DOI: 10.12693/APhysPolA.119.180 PACS numbers: 74.78.-w, 74.25.Sv, 74.25.F-, 74.25.Wx |