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Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ

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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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Authors and Affiliations

  1. ISTEC-SRL, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan

    Ayako Yamamoto, Wei-Zhi Hu, Fujio Izumit, Takashi Kamiyama & Setsuko Tajima

  2. Tokyo Univ. Mercantile Marine, Etchujima, Koto-ku, Tokyo, 135-8533, Japan

    Wei-Zhi Hu

  3. Natl. Inst. Res. Inorg. Mater., 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan

    Fujio Izumit

  4. Inst. Mater. Sci., Univ, Tsukuba, Tennodai, Tsukuba, Ibaraki, 305-8573, Japan

    Takashi Kamiyama

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  1. Ayako Yamamoto
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  2. Wei-Zhi Hu
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  3. Fujio Izumit
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  4. Takashi Kamiyama
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  5. Setsuko Tajima
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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

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