Synthesis and structural analysis of the superconducting lead cuprates, (Pb, Cu) (Sr, R)2 (R′, Ce)2Cu2Oz (R, R′: rare-earth element)

Toshihiko Maeda; Kazuhiro Sakuyama; Naomichi Sakai; H. Yamauchi; Shoji Tanaka

doi:10.1016/0921-4534(91)90488-K

Synthesis and structural analysis of the superconducting lead cuprates, (Pb, Cu) (Sr, R)₂ (R′, Ce)₂Cu₂O_z (R, R′: rare-earth element)

Toshihiko Maeda, Kazuhiro Sakuyama, Naomichi Sakai, H. Yamauchi, Shoji Tanaka

Research output: Contribution to journal › Article

22 Citations (Scopus)

Abstract

The structural analysis of a superconducting (Pb/Cu)-1222 phase, (Pb_0.5Cu_0.5)(Sr_0.875Eu_0.125)₂(Eu_0.75Ce_0.25)₂Cu₂ O_z (z≈9), is performed by Rietveld analysis using X-ray powder diffraction data. Pb, Cu and O atoms constituting the (Pb/Cu)O monolayer in this crystal are found to be displaced from their ideal crystallographic sites as previously reported for the (Pb/Cu)-1212 compound. In addition, (Pb, Cu)-1222 compounds with nominal compositions of (Pb, Cu)(Sr, R)₂(R', Ce)₂Cu₂O_z (R, R': rare-earth element) are synthesized and characterized. Nearly single-phase samples are successfully obtained for the compounds with R = R′ = Pr, Sm, Eu, Gd, Dy, Y or Ho, and for those with a pair of rare-earth elements, (R, R′) = (La, Eu), (Nd, Eu), (Nd, Dy), (Nd, Y), (Nd, Er), (Sm, Eu) or (Eu, Gd). Superconductivity is observed for the samples with R = R′ = Sm, Eu or Gd and also for those with (R, R′) = (La, Eu), (Nd, Eu), (Sm, Eu) or (Eu, Gd).

Original language	English
Pages (from-to)	337-344
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	177
Issue number	4-6
DOIs	https://doi.org/10.1016/0921-4534(91)90488-K
Publication status	Published - 1991 Jul 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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Maeda, T., Sakuyama, K., Sakai, N., Yamauchi, H., & Tanaka, S. (1991). Synthesis and structural analysis of the superconducting lead cuprates, (Pb, Cu) (Sr, R)₂ (R′, Ce)₂Cu₂O_z (R, R′: rare-earth element). Physica C: Superconductivity and its applications, 177(4-6), 337-344. https://doi.org/10.1016/0921-4534(91)90488-K

Synthesis and structural analysis of the superconducting lead cuprates, (Pb, Cu) (Sr, R)₂ (R′, Ce)₂Cu₂O_z (R, R′ : rare-earth element). / Maeda, Toshihiko; Sakuyama, Kazuhiro; Sakai, Naomichi; Yamauchi, H.; Tanaka, Shoji.

In: Physica C: Superconductivity and its applications, Vol. 177, No. 4-6, 01.07.1991, p. 337-344.

Research output: Contribution to journal › Article

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abstract = "The structural analysis of a superconducting (Pb/Cu)-1222 phase, (Pb0.5Cu0.5)(Sr0.875Eu0.125)2(Eu0.75Ce0.25)2Cu2 Oz (z≈9), is performed by Rietveld analysis using X-ray powder diffraction data. Pb, Cu and O atoms constituting the (Pb/Cu)O monolayer in this crystal are found to be displaced from their ideal crystallographic sites as previously reported for the (Pb/Cu)-1212 compound. In addition, (Pb, Cu)-1222 compounds with nominal compositions of (Pb, Cu)(Sr, R)2(R', Ce)2Cu2Oz (R, R': rare-earth element) are synthesized and characterized. Nearly single-phase samples are successfully obtained for the compounds with R = R′ = Pr, Sm, Eu, Gd, Dy, Y or Ho, and for those with a pair of rare-earth elements, (R, R′) = (La, Eu), (Nd, Eu), (Nd, Dy), (Nd, Y), (Nd, Er), (Sm, Eu) or (Eu, Gd). Superconductivity is observed for the samples with R = R′ = Sm, Eu or Gd and also for those with (R, R′) = (La, Eu), (Nd, Eu), (Sm, Eu) or (Eu, Gd).",

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