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Pinning potential in thick PrBa2Cu3Ox/YBa2Cu3O7−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 PrBa2Cu3Ox/YBa2Cu3O7−δ quasi-multilayers. Physica C, 470(1) pp. 55–60.

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Using Pulsed Laser Deposition we have fabricated thick quasi-multilayers composed of incomplete layers of PrBa2Cu3Ox (PrBCO) nano-dots and layers of YBa2Cu3O7−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 Jc at all fields in comparison with a pure YBCO reference sample, while the thicker samples showed an increased Jc only in high fields. We have also investigated the frequency dependence of Jc 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.

Item Type: Journal Item
Copyright Holders: 2009 Elsevier B.V.
ISSN: 0921-4534
Keywords: YBCO films; artificial pinning centres; quasi-multilayers; pinning potential; critical current density
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 43193
Depositing User: James Bowen
Date Deposited: 04 Jun 2015 09:53
Last Modified: 07 Dec 2018 10:31
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