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Superconductivity in New Pb-Based 1222 Layered Cuprates of (Pb0.75W0.25)Sr2(Eu2.0−x Ce x )Cu2O z

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Abstract

New Pb-based 1212 cuprates of (Pb0.8W0.2)Sr2(Nd1−x Ca x )Cu2O7−δ were synthesized. The sample with x=0.6 was reported to show superconductivity with an onset temperature up to 82 K. Interestingly, in order to obtain superconductivity of the sample, synthesis in N2 was necessary, then synthesis in air or post-treatment in O2 led to the disappearance of superconductivity.

Recently, we have successfully synthesized new Pb-based 1222 cuprates for the composition range of 0.3≤x≤1.0 in the (Pb0.75W0.25)Sr2(Eu2.0−x Ce x )Cu2O z system. The samples have a tetragonal crystal structure; the typical lattice parameters are a=0.3850 nm and c=2.889 nm. Among them, a sample with x=0.3 is discovered to show superconductivity with an onset of about 15 K. These cuprates have the same (Pb, W)O monolayers as the Pb-based 1212 cuprates described above. In these new cuprates, superconductivity appears when the samples are annealed not in air and under He atmosphere, but under high-pressure O2.

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Authors and Affiliations

  1. Department of Physics, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu-shi, Shizuoka, 431-3192, Japan

    Hiroyuki Sasakura & Yoshiya Akagi

  2. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8527, Japan

    Masashi Tanaka

  3. Department of Chemical Engineering, Graduate School of Engineering, Osaka Prefecture University, Naka-ku, Sakai-shi, Osaka, 599-8531, Japan

    Shigeki Tsukui & Motoaki Adachi

Authors
  1. Hiroyuki Sasakura
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  2. Yoshiya Akagi
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  3. Masashi Tanaka
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  4. Shigeki Tsukui
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  5. Motoaki Adachi
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Correspondence to Hiroyuki Sasakura.

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Sasakura, H., Akagi, Y., Tanaka, M. et al. Superconductivity in New Pb-Based 1222 Layered Cuprates of (Pb0.75W0.25)Sr2(Eu2.0−x Ce x )Cu2O z . J Supercond Nov Magn 27, 5–8 (2014). https://doi.org/10.1007/s10948-013-2442-7

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  • DOI: https://doi.org/10.1007/s10948-013-2442-7

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