The Biaxial Strain Dependence of Jc of a (RE)BCO Coated Conductor at 77 K in Low Fields

Greenwood, Jack R.; Surrey, Elizabeth; Hampshire, Damian P.

Abstract

Recently, we designed and commissioned a “crossboard” sample holder that can apply biaxial strains in the plane of a (RE)BCO coated conductor. It allows us to measure the critical current density J C for arbitrary combinations of x- and y-strain. Understanding the in-field, in-plane, biaxial strain dependence of a tape's J C (ε xx , ε yy ) is crucial for applications such as CORC or Roebel cables, as the cables are subjected to multiaxial strains during manufacturing and operation. Here, we present experimental data for J C (B, ε xx , ε yy ) on a SuperPower SCS4050 APC tape in magnetic fields up to 0.7 T, at 77 K. We also outline a theoretical model for the biaxial strain dependence of J C and use it to parameterize our data and show that the fraction of A-domains and B-domains are roughly equal (f = 0.49 ± 0.03) and that the strain sensitivity of the critical temperature is 1.8 ± 0.1 K% -1 and -1.3 ± 0.1 K% -1 along their a- and b-axes, respectively, for all the domains in this (RE)BCO tape. For the first time, we show both parabolic and linear strain dependencies of J C in a single tape by changing the angle between the applied strain direction and the twin boundaries in the (RE)BCO layer.

Citation

Greenwood, J. R., Surrey, E., & Hampshire, D. P. (2019). The Biaxial Strain Dependence of Jc of a (RE)BCO Coated Conductor at 77 K in Low Fields. IEEE Transactions on Applied Superconductivity, 29(5), Article 8637756. https://doi.org/10.1109/tasc.2019.2898343

• Journal Article Type: Article
• Acceptance Date: Feb 5, 2019
• Online Publication Date: Feb 8, 2019
• Publication Date: Aug 31, 2019
• Deposit Date: Feb 25, 2019
• Publicly Available Date: Feb 26, 2019
• Journal: IEEE Transactions on Applied Superconductivity
• Print ISSN: 1051-8223
• Electronic ISSN: 1558-2515
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 29
• Issue: 5
• Article Number: 8637756
• DOI: https://doi.org/10.1109/tasc.2019.2898343
• Public URL: https://durham-repository.worktribe.com/output/1307266
• Publisher URL: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8637756