Field and temperature scaling of the critical current density in commercial REBCO coated conductors

Abstract

Scaling relations describing the electromagnetic behaviour of coated conductors (CCs) greatly simplify the design of REBCO-based devices. The performance of REBCO CCs is strongly influenced by fabrication route, conductor architecture and materials, and these parameters vary from one manufacturer to the others. In the present work we have examined the critical surface for the current density, Jc(T,B,), of coated conductors from six different manufacturers: American Superconductor Co. (US), Bruker HTS GmbH (Germany), Fujikura Ltd. (Japan), SuNAM Co. Ltd. (Korea), SuperOx ZAO (Russia) and SuperPower Inc. (US). Electrical transport and magnetic measurements were performed at temperatures between 4.2 K and 77 K and in magnetic field up to 19 T.Experiments were conducted at three different orientations of the field with respect to the crystallographic c-axis of the REBCO layer, θ = 0°, 45° and 90°, in order to probe the angular anisotropy of Jc. In spite of the large variability of CCs' performance, we show here that field and temperature dependences of Jc at a given angle can be reproduced over wide ranges using a scaling relation based only on three parameters. Furthermore, we present and validate a new approach combining magnetic and transport measurements for the determination of the scaling parameters with minimal experimental effort.

An equation for the quench propagation velocity valid for high field magnet use of REBCO coated conductors

“…Recently, it has been shown that the T dependence of J C of CCs from different manufacturers can be described over a broad range of temperatures and fields by an exponential law, J C ðT; BÞ ¼ J C ðT ¼ 0; BÞe ÀT=T Ã . Deviations from this behavior are observed at temperatures տ 50 K. 22 The exponential dependence of J C is connected with the presence of defects generating weak isotropic pinning, and T Ã is the characteristic pinning energy at these defects. 23,24 Other dominant pinning mechanisms can lead to different J C ðT; BÞ characteristics.…”

“…25 The T Ã values associated with tapes from different manufacturers, for different orientations between the field and the tape surface, are reported in Ref. 22. From the expression for J C ðT; BÞ, one can easily deduce the following formula that relates T CS to parameters directly chosen by the magnet designer, namely, the operating conditions and the current margin…”

Bulk and CC-Tape Based Superconducting Shields for Magnetic Cloaks

“…Due to sensitivity of used materials to the applied magnetic field: the critical current density (Jc) in case of superconductors [18] and the relative magnetic permeability in case of a ferromagnetic material, the cloaking effect was observed only for the small range of the applied field amplitudes. The optimal performance for the BSCCO-2212 insert and REBCO insert is observed by fields that are not the same.…”

From colossal magnetoresistance to solar cells: An overview on 66 years of research into perovskites

“…Epitaxy in the HTSC layer is obtained by using rolling‐assisted, bi‐axially textured substrates as tape, and via the buffer layers which can be ion beam assisted deposited or inclined substrate deposited (under an angle). Deposition of the YBCO layer is accomplished via metal‐organic inkjet printing, followed by thermal pyrolytic treatments . In 2016, impressive values for j c of up to 3.5 × 10 6 A cm −2 have been reached in the laboratories of some of the major industrial players.…”