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Coherent magnetic vortex motion in optically formed channels for easy flow in YBa2Cu3O7−x superconducting thin films

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Abstract

We report our results of investigation of electric and magnetic properties of partially oxygen-depleted channels for easy vortex motion in YBa2Cu3O7−x (YBCO) superconducting, 50-μm-wide, and 100-μm-long microbridges at temperatures below the onset of the superconducting state critical temperature T onc . The channels were produced by means of a laser-writing technique. The writing was performed using a 0.1–0.3 W power, continuous-wave laser radiation focused down to a ~ 5 μm spot on the surface of a superconducting film in a nitrogen gas atmosphere, and resulted in perpendicular stripes (channels) with partial (x ~ 0.2) reduction of the oxygen content in the YBCO stripe. The oxygen-depleted channels exhibit a depressed T c and lower both the critical current density and the first critical magnetic field, as compared with the laser-untreated areas. The bias current applied to the bridge self-produced a magnetic flux that penetrated the channels in a form of Abrikosov magnetic vortices that, subsequently, moved coherently (a quasi-Josephson effect) along the channels in the narrow temperature range of 0.943 T onc –0.98 T onc and manifested themselves as steps on the current–voltage characteristics of our microbridges. Our results demonstrate that laser-induced formation of artificial channels of the flux flow can be used for a precise control of vortex nucleation and their coherent motion in pre-assigned regions of thin-film YBCO devices.

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Acknowledgments

A. J. wants to thank for part of financial support from EU SF project of No. VP1-2.2-ŠMM-09-V-01-005 and project of No. PRO-12070 of the Research Council of Lithuania. Work in Warsaw was supported in part by the European Regional Development Fund (Innovative Economy, POIG.01.01.02-00-108/09).

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Authors and Affiliations

  1. Department of Physics, Vilnius Gediminas Technical University, LT 10223, Vilnius, Lithuania

    A. Jukna & L. Steponavičienė

  2. Department of General and Inorganic Chemistry, Vilnius University, LT 03225, Vilnius, Lithuania

    V. Plaušinaitienė & A. Abrutis

  3. Centre for Physical Sciences and Technology, Semiconductor Physics Institute, LT 01108, Vilnius, Lithuania

    A. Maneikis, K. Šliužienė & V. Lisauskas

  4. Institute of Electron Technology, 02668, Warszawa, Poland

    Roman Sobolewski

  5. Departments of Electrical and Computer Engineering and Physics and Astronomy, Materials Science Program, and Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14627-0231, USA

    Roman Sobolewski

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  1. A. Jukna
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  7. V. Lisauskas
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  8. Roman Sobolewski
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Correspondence to A. Jukna.

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Jukna, A., Steponavičienė, L., Plaušinaitienė, V. et al. Coherent magnetic vortex motion in optically formed channels for easy flow in YBa2Cu3O7−x superconducting thin films. Appl. Phys. B 113, 327–332 (2013). https://doi.org/10.1007/s00340-013-5484-4

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  • DOI: https://doi.org/10.1007/s00340-013-5484-4

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