Critical Current Density of YBa2Cu3O7-delta Coated Conductors Under High Compression in High Fields

Higgins, J.S.; Hampshire, D.P.

Abstract

From an engineering standpoint, the magnetic field (B), temperature (T), and strain dependence (ε) of the critical current density (JC) in practical superconducting wires/tapes is critical for optimizing device design using superconducting technology. The highly anisotropic and brittle nature of YBa2Cu3O7-δ (YBCO) coated conductor tapes means a detailed investigation of the parameters that affect the critical current is a challenging experimental task to achieve within a single strain apparatus. Here we present critical current measurements as a function of strain on YBCO coated conductors made using a bending apparatus designed for use in horizontal split-pair magnet systems with a 40 mm diameter bore. The design and configuration of the apparatus allows different compressive and tensile strain between -1.4% <; εapplied <; +0.5% to be applied. Magnetic fields up to 0.7 T at T=77 K , and 15 T at 4.2 K, were applied at different angles (θ) with respect to the coated conductor surface. At 77 K, JC can be reversibly reduced by more than 85% with a ~ -1% compressive strain at 0.7 T. For high compressive strains, JC versus strain data show convex behavior. We provide a preliminary parameterization of the scaling relation for JC (B,T,ε,θ).

Citation

Higgins, J., & Hampshire, D. (2011). Critical Current Density of YBa2Cu3O7-delta Coated Conductors Under High Compression in High Fields. IEEE Transactions on Applied Superconductivity, 21(3), 3234-3237. https://doi.org/10.1109/tasc.2010.2092735

• Journal Article Type: Article
• Publication Date: 2011-06
• Deposit Date: Jun 30, 2011
• Journal: IEEE Transactions on Applied Superconductivity
• Print ISSN: 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 21
• Issue: 3
• Pages: 3234-3237
• DOI: https://doi.org/10.1109/tasc.2010.2092735