We have reported high-
Jc Sm
1+xBa
2-xCu
3O
y (SmBCO) films prepared by a low-temperature growth (LTG) technique. The LTG-SmBCO films showed a
Jc of 0.28 MA/cm
2 (77 K,
B//
c,
B=5 T). However, the
Jc of these films in the magnetic fields above 5 T dropped and were lower than that of NbTi wire (4.2 K). In this study, we introduced nanoparticles with low
Tc (low-
Tc-nanoparticles) into LTG-SmBCO films to improve the
Jc at the high magnetic field. The LTG-SmBCO + 1.4 vol.% nanoparticle film result in a
Jc of 0.37 MA/cm
2 (77 K,
B//
c,
B = 5 T) and 0.10 MA/cm
2 (77 K,
B//
c,
B = 8 T). Furthermore, the
Jc at 65 K in a field of 16 T (
B//
c) reached 0.05 MA/cm
2. Elemental mapping clarified that LTG-SmBCO + 1.4 vol.% nanoparticle film had nanosized low-
Tc particles with an
x of 0.15-0.30 and low-
Tc network with an
x of 0.05-0.15, which were dispersed in the high-
Tc matrix. We speculate that the
Jc under high magnetic field conditions depends not only on the distribution and size of low-
Tc regions, but also on the Sm/Ba composition within the low-
Tc regions.
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