Thick secondary phase pinning-enhanced YBCO films on technical templatesстатья
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Дата последнего поиска статьи во внешних источниках: 24 апреля 2018 г.
Аннотация:The critical current Ic(B) of YBa2Cu3O7-x (YBCO) coated conductors can be increased by growing thicker superconductor layers as well as improving the critical current density Jc(B) by the incorporation of artificial pinning centers. We studied the properties of pulsed laser deposited BaHfO3 (BHO)-doped YBCO films with thicknesses of up to 5 μm on rolling-assisted biaxially textured Ni-5 at% W tape and alternating beam assisted deposition textured YSZ layers on stainless steel. X-Ray diffraction confirms the epitaxial growth of the superconductor on the buffered metallic template. BHO additions reduce the YBCO film porosity and lower the probability to grow misoriented grains, hence preventing the Jc decrease observed in undoped films with thicknesses >2 μm. Thereby a continuous increase in Ic at 77 K is achieved. A mixed structure of secondary phase nanorods and platelets with different orientations increases Jc(B) in the full angular range and simultaneously lowers the Jc anisotropy compared to pristine YBCO.