نتایج جستجو برای: yba2cu3o7
تعداد نتایج: 1061 فیلتر نتایج به سال:
نانوذرات gd2o3 برای اولین بار، به روش سل ژل احتراقی و ابررسانای دمای بالای yba2cu3o7 به روش سل ژل تهیه شدند. الگوی پرتو ایکس از نانوذرات و ابررسانای تهیه شده، تک فاز بودن هر دو را تایید کرد. اندازه متوسط نانوذرات gd2o3 با استفاده از رابطهی شرر 29 نانومتر برآورد شد، که با نتایج حاصل از تصاویر tem، هم خوانی دارد. نانوذرات با دو درصد وزنی 05/0 و 1/0 به نمونه ابررسانای ybco اضافه شد. ریخت شناسی، خ...
Magneto-fluctuations of the normal resistance RN have been reproducibly observed in YBa2Cu3O7-d biepitaxial grain boundary junctions at low temperatures. We attribute them to mesoscopic transport in narrow channels across the grain boundary line, occurring even in the presence of large voltage drops. The Thouless energy appears to be the relevant energy scale. Possible implications on the under...
067004-1 We have directly observed well-separated Josephson vortex splinters with unquantized magnetic flux at asymmetric 45 grain boundaries in YBa2Cu3O7 films by imaging magnetic flux with scanning SQUID microscopy. The existence of these splinter vortices has been predicted and is well described by a model based on dx2 y2 pairing symmetry and facetting of the grain boundary on a length scale...
The in-plane normal-state resistivity of Zn-doped YBa2Cu3O7−δ and heavily underdoped pure YBCO single crystals is measured down to low temperatures under magnetic fields up to 18 T. We found that the temperature dependence of the normal-state ρab does not obey log(1/T ) and tends not to diverge in the low temperature limit. The result suggests that the “ground state” of the normal state of YBCO...
Based on the linearized Eilenberger equations, the upper critical field (Hc2) of mixed dand s-wave superconductors has been microscopically studied with an emphasis on the competing effects of mass anisotropy and spin Zeeman coupling. We find the mass anisotropy always enhance Hc2 while the Zeeman interaction suppresses Hc2. As required by the thermodynamics, we find Hc2 is saturated at zero te...
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