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We developed a low-temperature growth (LTG) technique as a novel deposition process to obtain RE1+xBa2-xCu3Oy (REBCO) thin films with high superconducting properties. SmBCO films fabricated using the LTG-technique (LTG-SmBCO) showed complete c-axis orientations at a low substrate temperature (Ts). This Ts is about 100°C lower than the Ts when fabricating c-axis oriented SmBCO films using the conventional vapor growth method. Moreover, the critical current density (Jc) of the LTG-SmBCO in magnetic fields at 77 K has been improved reaching a high value of 0.17 MA/cm2 at 5 T (B//c). The magnetic field angular dependence of the Jc at 77 K in LTG-SmBCO had a smaller anisotropy than that in PLD-SmBCO. From the microstructure observation, we found that the LTG-SmBCO showed a compositional fluctuation in Sm/Ba. We assume that the high Jc of LTG-SmBCO was affected by the solid solution acting as three-dimensional pinning center. From the viewpoint of diffusion in the solid phase, we speculated that this solid solution was generated by the low Ts.

Fabrication of REBa2Cu3Oy Thin Films for High-Jc Coated Conductors in Magnetic Fields