Easy Vortex Motion in an Artificial Channel of YBa2Cu3O7-δSuperconducting Films

A. Jukna a, b, c, I. Barboy a, G. Jung a, A. Abrutis d, X. Li e, D. Wang e and R. Sobolewski e a Department of Physics, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel b High-Tc-Superconductivity Lab., Semiconductor Physics Institute, 01108 Vilnius, Lithuania c Department of Physics, Faculty of Natural Sciences, Vilnius Gediminas Technical University, LT-10223, Vilnius, Lithuania d Department of General and Inorganic Chemistry, Vilnius University, LT-03225 Vilnius, Lithuania e Department of Electrical Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14627, USA

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Received: 26 08 2007;

Quasi-Josephson effect produced by a coherent vortex motion in the horizontal part of the laser-performed Π-shaped channel of a YBa2Cu3O7-δ superconducting bridge was investigated by means of electric transport measurements. We observed that in our structures, in a limited range of temperatures and bias currents, the vortices were confined in the channel only and moved coherently with the velocity of 3 × 104 m/s. The corresponding current-voltage characteristics of the bridge exhibited Josephson-like voltage steps with the amplitude dependent on temperature, but independent of the bias current.

DOI: 10.12693/APhysPolA.113.959 PACS numbers: 74.25.Sv, 74.25.Qt, 74.78.Bz