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Double disordered YBCO coated conductors of industrial scale: high currents in high magnetic field

Authors
Abraimov, D
Ballarino, A
Bottura, L
Dietrich, R
Francis, A
Jaroszynski, J
Majkic, G S
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Published in Superconductor Science and Technology. 2015, vol. 28, no. 11, p. 114007
Abstract A significant increase of critical current in high magnetic field, up to 31 T, was recorded in long tapes manufactured by employing a double-disorder route. In a double-disordered high-temperature superconductor (HTS), a superimposing of intrinsic and extrinsic disorder takes place in a way that (i) the intrinsic disorder is caused by local stoichiometry deviations that lead to defects of crystallinity that serve as pining centers in the YBa2Cu3O x−δ matrix and (ii) the extrinsic disorder is introduced via embedded atoms or particles of foreign material (e.g. barium zirconate), which create a set of lattice defects. We analyzed possible technological reasons for this current gain. The properties of these tapes over a wider field-temperature range as well as field anisotropy were also studied. Record values of critical current as high as 309 A at 31 T, 500 A at 18 Tm and 1200 A at 5 T were found in 4 mm wide tape at 4.2 K and B perpendicular to tape surface. HTS layers were processed in medium-scale equipment that allows a maximum batch length of 250 m while 22 m long batches were provided for investigation. Abnormally high ratios (up to 10) of critical current density measured at 4.2 K, 19 T to critical current density measured at 77 K, self-field were observed in tapes with the highest in-field critical current. Anisotropy of the critical current as well as angular dependences of n and α values were investigated. The temperature dependence of critical current is presented for temperatures between 4.2 and 40 K. Prospects for the suppression of the dog-bone effect by Cu plating and upscale of processing chain to >500 m piece length are discussed.
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Research group Groupe Senatore
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ABRAIMOV, D et al. Double disordered YBCO coated conductors of industrial scale: high currents in high magnetic field. In: Superconductor Science and Technology, 2015, vol. 28, n° 11, p. 114007. doi: 10.1088/0953-2048/28/11/114007 https://archive-ouverte.unige.ch/unige:76166

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Deposited on : 2015-10-14

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