Abstract
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.
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