${\rm GdBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Coated Conductor on ${\rm BaZrO}_{3}$-Buffered IBAD-MgO Template

Abstract

We report a successful fabrication of GdBa2Cu3O7-delta (GdBCO) coated conductor on the ion-beam assisted deposition (IBAD) MgO template with a new buffer layer of BaZrO3 (BZO). The BZO films were deposited on the IBAD-MgO template at various substrate temperatures (T S) and oxygen partial pressures (PO2) by pulsed laser deposition (PLD). In the broad ranges of T S and PO2, all BZO layers showed almost uniform in-plane texture (Deltaphi of ~ 6deg ), implying that BZO is an attractive buffer layer. The surface roughness of BZO layer was sensitive to PO2 but not to T S. On the optimally processed BZO buffer layer with 5.1 nm RMS roughness, GdBCO coated conductor deposited at T S of 750degC and PO2 of 400 mTorr exhibited Deltaphi of 4.4deg , T c,zero of 90.3 K, and J c of 1.35 MA/cm2 (77 K, self-field).