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Structural modification in HgBa2CaCu2Oy thin films

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The effect of oxygen content, or doping level, on the superconductivity of Hg-system superconductors has been paid much attention, but the effect of the modification of the structure has not been fully understood. HgBa2CaCu2Oy thin films, after annealing in different atmospheres with different values of Tc, were studied by high-resolution x-ray diffraction, including conventional /2 scans, scans and rocking curves. It is found that the best quality does not mean the highest Tc. Careful analysis shows that structural imperfect may cause the increase of Tc value. Considering the change of the Tc value of the crystals after annealing in different atmospheres, we suggest that besides oxygen content, structural modification may play an important role in the superconductivity of HgBa2CaCu2Oy.

Document Type: Miscellaneous

Affiliations: Material Physics Laboratory, State Key Laboratory for Mesoscope Physics, Department of Physics, Peking University, Beijing 100871, People's Republic of China

Publication date: March 1, 2002


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