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.