The Magnetic Properties of SmBCO Coated Conductors Fabricated by Evaporation Using Drum in Dual Chamber (EDDC) Processing

The magnetic properties of SmBa 2 Cu 3 O 7-x (SmBCO) coated conductor (CC) that was fabricated on LaMnO 3 (LMO)/IBAD-MgO substrates using Evaporation using Drum in Dual Chamber (EDDC), which is a batch type co-evaporation system, was investigated. LMO buffer layer was deposited on IBAD-MgO templates by PLD method. The measurements of both the magnetization M ( H ) and the resistance R ( T ) for the SmBCO CC, were carried out at temperatures between 10 and 120 K in fields up to 8.5 T, using a PPMS-9T (with both ACMS and DCR options, Quantum Design). The SmBCO CC exhibited T c (onset temperature) of 94.7 K with a narrow transition width of 0.6 K, which indicates a good homogeneity of the superconducting properties. The upper critical field H c2 near T c of the SmBCO CC has been estimated by the resistance R ( T ) approaches. The magnetization curves M ( H ) are symmetric about the line M = 0 for the SmBCO CC with the field applied parallel to both the c -axis and c -axis +45°. For the SmBCO CC with the field applied parallel to the ab -plane, they are asymmetric. These symmetric and asymmetric curves can be explained by introducing the bulk pinning of 1-D flux lines and surface barrier-dominated system of 2-D pancake vortices.