Enhanced Critical Current under a Magnetic Field in Sm1+xB2-xCu3Oy Thick Films Prepared Using Low-temperature Growth Technique

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REBa2Cu3Oy films require a high critical current ($I_{\text{c}}$) under a high magnetic field at 77 K when using power applications. In this study, we fabricated Sm1.04Ba1.96Cu3Oy (SmBCO) thick films prepared using a low-temperature growth (LTG) technique in order to improve crystal quality and enhance flux pinning. The LTG multilayer thick film using a (SmBCO/Sm-rich layer) $\times$ $N$ ($N = 1, 2, \ldots$) multilayer system showed a high crystal quality. Additionally, the LTG multilayer thick film showed not only a high density of dislocations but also low-$T_{\text{c}}$ particles within a high-$T_{\text{c}}$ matrix. Therefore, the LTG multilayer film showed an $I_{\text{c}}$ of 20.6 A/cm-width (77 K, $B\parallel c$, $B = 5$ T) and had a thickness of only 1.35 μm and a low anisotropy $I_{\text{c}}$ for the high-magnetic-field direction. These results support to the developing possibility of power devices using a solenoid-type coil.
2007-09-25