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New Members of the Pb-based 1222 Superconductor Containing Phosphorus: (Pb0.75P0.25)Sr2(Ln1.9−x Ce x Sr0.1)Cu2O z (Ln=Sm and Gd)

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Abstract

We previously reported on the synthesis of new Pb-based 1222 superconductor containing phosphorus in the (Pb0.75P0.25)Sr2(Eu1.9−x Ce x Sr0.1)Cu2O z system. Recently, we have discovered new members of the Pb-based 1222 superconductor containing phosphorus in the (Pb0.75P0.25)Sr2(Ln1.9−x Ce x Sr0.1)Cu2O z (Ln=Sm and Gd) systems. In each system, it is found that the samples of almost the single 1222 phase can be obtained for a wide composition area of 0.3≤x≤1.0. After annealing under 143 atm O2 atmosphere at 400 °C, each sample of Ln=Sm and Gd with x=0.3 is found to show an onset of resistivity-drop at about 28 K and at about 24 K, respectively. Moreover, each samples of Ln=Sm and Gd is found to show an onset of diamagnetic signal at about 25 K and about 22 K, respectively. From these facts, these samples of Ln=Sm and Gd are found to be new members of the Pb-based 1222 superconductor containing phosphorus.

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Correspondence to Hiroyuki Sasakura.

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Sasakura, H., Akagi, Y., Tanaka, M. et al. New Members of the Pb-based 1222 Superconductor Containing Phosphorus: (Pb0.75P0.25)Sr2(Ln1.9−x Ce x Sr0.1)Cu2O z (Ln=Sm and Gd). J Supercond Nov Magn 25, 245–248 (2012). https://doi.org/10.1007/s10948-011-1286-2

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  • DOI: https://doi.org/10.1007/s10948-011-1286-2

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