CUED Publications database

Self-assembled artificial pinning centres in thick YBCO superconducting films

Mikheenko, P and Abell, JS and Sarkar, A and Dang, VS and Awang Kechik, MM and Tanner, JL and Paturi, P and Huhtinen, H and Hari Babu, N and Cardwell, DA and Crisan, A (2010) Self-assembled artificial pinning centres in thick YBCO superconducting films. Journal of Physics: Conference Series, 234. ISSN 1742-6588

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Abstract

Strong, artificial pinning centres are required in superconducting films of large thickness for power applications in high magnetic fields. One of the methods for the introduction of pinning centres in such films is substrate decoration, i.e., growing nanoscale islands of certain materials on the substrate prior to the deposition of the superconducting film. Two other methods are building up a layered distribution of a second phase and homogeneous incorporation of second phase inclusions from a compositional target. In this paper, we compare the effectiveness of these methods in terms of the type of the self-assembly of nanoparticles. The comparison is made over a large set of YBa2Cu3O7 films of thickness up to 6.6 μm deposited with Au, Ag, Pd, LaNiO3, PrBa2Cu 3O7, YBCO, BaZrO3 and Gd2Ba 4CuWOy nanoparticles. It is found that substrate-decoration self-assembly is able to provide higher critical current in low magnetic field than the incorporation of homogeneous second phase in the sample microstructure. By specific modification of substrate decoration we achieved the self-field critical current per centimetre of width of 896 A/cm at 77.3 K and 1620 A/cm at 65 K in a film of thickness of 4.8 μm. © 2010 IOP Publishing Ltd.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:39
Last Modified: 28 Nov 2014 19:05
DOI: 10.1088/1742-6596/234/2/022022