Pinning potential in thick PrBa₂Cu₃O_x/YBa₂Cu₃O_7−δ quasi-multilayers

Crisan, A.; Dang, V. S.; Mikheenko, P.; Tse, Y. Y.; Sarkar, A.; Bowen, J. and Abell, J. S. (2009). Pinning potential in thick PrBa₂Cu₃O_x/YBa₂Cu₃O_7−δ quasi-multilayers. Physica C, 470(1) pp. 55–60.

DOI: https://doi.org/10.1016/j.physc.2009.10.006

Abstract

Using Pulsed Laser Deposition we have fabricated thick quasi-multilayers composed of incomplete layers of PrBa₂Cu₃O_x (PrBCO) nano-dots and layers of YBa₂Cu₃O_7−δ (YBCO). The number of such sequences was between 2 and 6, with the thickness of individual YBCO layers between 565 and 885 nm, and total thickness between 1.13 and 5.31 μm. For the thinner quasi-multilayer, DC magnetization studies showed an increase in the critical current density J_c at all fields in comparison with a pure YBCO reference sample, while the thicker samples showed an increased J_c only in high fields. We have also investigated the frequency dependence of J_c from AC susceptibility studies and found that the pinning potential is well described by a logarithmic dependence on current density. Pinning potentials in PrBCO/YBCO quasi-multilayers also proved to be higher than in the reference sample at high fields. From angle-dependent transport measurements we have found indications of strong pinning centres induced by the (PrBCO) nano-dots, both isotropic and c-axis correlated.

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About

• Item ORO ID
• 43193
• Item Type
• Journal Item
• ISSN
• 0921-4534
• Keywords
• YBCO films; artificial pinning centres; quasi-multilayers; pinning potential; critical current density
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2009 Elsevier B.V.
• Depositing User
• James Bowen