Abstract
Carbon contents inHgBa 2 CuO 4+δ andstarting materials (HgO, BaO, and CuO) for preparing it weredetermined by infrared spectroscopy to examine influences ofCO 2-3 ions substituted for[HgO 2 ] 2− groups on itssuperconducting properties. Measurements of DC magnetic susceptibilitiesand resistivities revealed that superconducting transition in anoxygen-annealed sample with a minimum C content of 0.88 mol% wasvery sharp with T c 's of 98.0 K (negativemagnetization) and 96.5 K (zero resistance),respectively. They are the highest T c 's thathave ever been attained inHgBa 2 CuO 4+δ including single crystals. Structural data obtained by neutronpowder diffraction showed our sample to have high quality and a δvalue of 0.122(5).
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Yamamoto, A., Hu, WZ., Izumit, F. et al. Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ . Journal of Low Temperature Physics 117, 789–793 (1999). https://doi.org/10.1023/A:1022565832711
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DOI: https://doi.org/10.1023/A:1022565832711