Role of Rebco/Ceo2 Interface on Superconducting and Mechanical Properties During Tensile Deformation

Abstract

Degradation of critical current (Ic) for ReBa2Cu3O7-x (ReBCO) superconductor tape under tensile stress is extremely crucial for the stability of magnets in general and fusion magnets in specific at elevated fields such as (20T). Extensive research is carried out on the effect of tensile stress on Ic values, considering the ReBCO tape with multiple nanocomposite layers as a homogeneous entity, while neglecting the interface between the layers. Herein this piece of work, for the very first time, the interface between ReBCO/CeO2 nanocomposite is investigated in detail under varying tensile stress. In-situ EBSD technology was followed to systematically examine the crystal orientation rotation within CeO2 nanofilms. Furthermore, a theoretical analysis for lattice-mismatch stress within ReBCO layer transmitted through ReBCO/CeO2 interface is also provided. Ic degradation due to ReBCO/CeO2 interface is calculated, and the relevant stress under realistic magnetic conditions was evaluated by utilizing a multi-physics simulation technique. This work provides a novel approach for in-depth investigation of the Ic degradation mechanism in ReBCO tape subjected to varying stress.

Keywords: CeO2 layer, Interface, Lattice mismatch, In-situ EBSD, tensile deformation, FE modeling