Artificial pinning in thick YBCO films: Pinning potential and c-axis correlation



: Crisan A, Mikheenko P, Sarkar A, Dang VS, Kechik MMA, Abell JS, Paturi P, Huhtinen H

Publisher: ELSEVIER SCIENCE BV

: 2010

: Physica C: Superconductivity and its Applications

: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS

: PHYSICA C

: 19

: 470

: 19

: 840

: 843

: 4

: 0921-4534

DOI: https://doi.org/10.1016/j.physc.2010.02.033(external)


We have introduced artificial pinning centres in thick (>1 mu m) YBCO films grown by Pulsed Laser Deposition using substrate decoration, quasi-multilayers, and target doping approaches. We have found that the frequency dependence of critical current density is consistent with a logarithmic dependence of pinning potential on current density. For most of materials used as nano-dots, artificially-induced pinning centres have a larger potential than natural ones. From angle-dependent in-field transport measurements and from Transmission Electron Microscopy we have found evidence of c-axis correlated pinning centres. (C) 2010 Elsevier B.V. All rights reserved.



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