New Members of the Pb-based 1222 Superconductor Containing Phosphorus: (Pb0.75P0.25)Sr2(Ln1.9−xCexSr0.1)Cu2Oz (Ln=Sm and Gd)

• Published in: Journal of superconductivity and novel magnetism 2012-02, Vol.25 (2), p.245-248
• Main Authors: Sasakura, Hiroyuki, Akagi, Yoshiya, Tanaka, Masashi, Tsukui, Shigeki, Adachi, Motoaki
• Format: Article
• Language: English
• Subjects: Annealing; ANNEALING PROCESSES; ATMOSPHERES; Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; COPPER OXIDE; CUPROUS OXIDE; Effects of material synthesis, crystal structure, and chemical composition; ELECTRICAL CONDUCTIVITY; Exact sciences and technology; FABRICATION; Lead (metal); Magnetic Materials; Magnetism; Original Paper; Phosphorus; Physics; Physics and Astronomy; Strongly Correlated Systems; SUPERCONDUCTIVITY; SUPERCONDUCTORS; Synthesis; Transition temperature variations
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-011-1286-2

We previously reported on the synthesis of new Pb-based 1222 superconductor containing phosphorus in the (Pb 0.75 P 0.25 )Sr 2 (Eu 1.9− x Ce x Sr 0.1 )Cu 2 O z system. Recently, we have discovered new members of the Pb-based 1222 superconductor containing phosphorus in the (Pb 0.75 P 0.25 )Sr 2 (Ln 1.9− x Ce x Sr 0.1 )Cu 2 O 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 O 2 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.