We have reported the superconducting properties of Sm
1+xBa
2-xCu
3O
y (SmBCO;
x=0.08) thin films prepared by the low-temperature growth (LTG) technique. To investigate the effect of the Sm/Ba composition ratio (
x) in the SmBCO, we deposited an upper layer with the Sm/Ba composition of
x=0.00-0.12. From the result of the etch pit and composition analysis, we found that the Sm/Ba composition ratio in the SmBCO film influenced possible pinning centers, such as linear defects including screw dislocation and edge dislocation, and nano-size low-critical temperature (
Tc) phase acting as a field-induced pinning center. Moreover, we noticed the Sm/Ba composition ratio in the SmBCO film influenced
Tc and critical current density (
Jc). As a result, the SmBCO films with
x=0.04 and 0.08 showed
Jc=2.8 × 10
5 A/cm
2 and 1.7 × 10
5 A/cm
2 (77 K,
B//
c, 8 T), respectively.
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