Growth Behaviors of High ${\rm J}_{\rm c}$ ${\rm Gd}_{1+{\rm x}}{\rm Ba}_{2-{\rm x}}{\rm Cu}_{3}{\rm O}_{7}$ Coated Conductors on IBAD-MgO Templates Probed by X-Ray Diffraction and Raman Scattering Spectroscopy

Gd
_1+x
Ba
_2-x
Cu
₃
O
₇
(GdBCO) coated conductors on Ion-beam assisted deposition (IBAD)-MgO templates were grown by pulsed laser deposition (PLD). Growth conditions for the PLD of high quality of GdBCO turn out to have a rather larger range than for Nd-based cuprate thin films. The structural properties and critical current of GdBCO have been measured. The GdBCO layers show ~ 100 A/cm at 0.5 micron-thick films. In our measurement of Raman scattering spectroscopy from 180 ~ 1,200 cm
^-1
, one strong B
_1g
mode and two strong A
_1g
modes were observed. The high critical-current is ascribed to well-grown highly textured 123-structure without cation disorder and oxygen deficiency. It is notable that the GdBCO films do not have second phases like BaCuO
₂
, which is a signature liquid phase-based material that occurs in other rare-earth based cuprates.