Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: Ion and electron beam induced processes
DS 19.4: Talk
Wednesday, March 18, 2015, 10:45–11:00, H 2032
Strong vortex matching effects in YBCO films with periodic modulations of the superconducting order parameter fabricated by masked ion irradiation — LT Haag1, G Zechner1, W Lang1, •M Dosmailov2, MA Bodea2, and JD Pedarnig2 — 1University of Vienna, Faculty of Physics, Electronic Properties of Materials, Boltzmanngasse 5, A-1090 Wien, Austria — 2Johannes-Kepler-University Linz, Institute of Applied Physics, Altenbergerstrasse 69, A-4040 Linz, Austria
We report on measurements of the magnetoresistance and of the critical current in thin films of the high-temperature superconductor YBa2Cu3O7-d (YBCO). A square array of regions with suppressed superconducting order parameter has been created in these films by introducing point defects via irradiation with He+ ions through a silicon stencil mask. In such a structure distinct peaks of the critical current can be observed at commensurate arrangements of magnetic flux quanta with the artificial defect lattice. Concurrently, the magnetoresistance shows pronounced minima. Both observations demonstrate that the strong intrinsic pinning in YBCO can be overcome by a periodic array of ion-damage columns with 300 nm spacing [1].
[1] L.T. Haag, M. Dosmailov et al, Physica C 503 (2014) 75-81.
Acknowledgements: This work was supported by the Research Network "Nanoscience and Engineering in Superconductors (NES)" of the European Science Foundation and the COST Action MP-1201.