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

We report a successful fabrication of GdBa
₂
Cu
₃
O
_7-delta
(GdBCO) coated conductor on the ion-beam assisted deposition (IBAD) MgO template with a new buffer layer of BaZrO
₃
(BZO). The BZO films were deposited on the IBAD-MgO template at various substrate temperatures (
T

_S
) and oxygen partial pressures (
P
O
₂
) by pulsed laser deposition (PLD). In the broad ranges of
T

_S
and
P
O
₂
, all BZO layers showed almost uniform in-plane texture (Deltaphi of ~ 6
^deg
), implying that BZO is an attractive buffer layer. The surface roughness of BZO layer was sensitive to
P
O
₂
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 750
^deg
C and
P
O
₂
of 400 mTorr exhibited Deltaphi of 4.4
^deg
,
T

_c,zero
of 90.3 K, and
J

_c
of 1.35 MA/cm
²
(77 K, self-field).