High-Tc superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr2(Ce,Y)3Cu2O11+δ

Y. Morita; T. Nagai; Y. Matsui; H. Yamauchi; M. Karppinen

doi:10.1103/PhysRevB.70.174515

High-T_c superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr₂(Ce,Y)₃Cu₂O_11+δ

Y. Morita
, T. Nagai
, Y. Matsui
, H. Yamauchi
, M. Karppinen^*

^*Corresponding author for this work

Not published at Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

Abstract

We have synthesized high-quality samples of the s=3 member of the (Cu,Mo)-12s2 homologous series of layered copper oxides. The (Cu,Mo)-1232 phase forms as a single phase for the cation composition (Cu_0.75Mo _0.25)Sr₂(Ce_0.67 Y_0.33) ₃Cu₂O_11+δ through solid-state synthesis in air, but the samples as synthesized are not superconductive. Superconductivity is induced in the air-synthesized samples by means of high-pressure oxygenation carried out at 5 GPa and 500°C in the presence of Ag₂O₂ as an excess oxygen source. With increasing ratio of Ag₂O₂ to the (Cu,Mo)-1232 phase the c-axis lattice parameter gradually decreases and T_c increases. The highest T _c value of 53 K reached for samples oxygenated in the presence of 100 mol% Ag₂O₂ exceeds the values reported for Cu-based two-fluorite-layer compounds.

Original language	English
Article number	174515
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.70.174515
Publication status	Published - 1 Nov 2004
MoE publication type	A1 Journal article-refereed

Funding

This work was supported by Grants-in-aid for Scientific Research (Nos. 15206002 and 15206071) from the Japan Society for the Promotion of Science, and the Nanotechnology Support Project of the MEXT, Japan.

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10.1103/PhysRevB.70.174515

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title = "High-Tc superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr2(Ce,Y)3Cu2O11+δ",

abstract = "We have synthesized high-quality samples of the s=3 member of the (Cu,Mo)-12s2 homologous series of layered copper oxides. The (Cu,Mo)-1232 phase forms as a single phase for the cation composition (Cu0.75Mo 0.25)Sr2(Ce0.67 Y0.33) 3Cu2O11+δ through solid-state synthesis in air, but the samples as synthesized are not superconductive. Superconductivity is induced in the air-synthesized samples by means of high-pressure oxygenation carried out at 5 GPa and 500°C in the presence of Ag2O2 as an excess oxygen source. With increasing ratio of Ag2O2 to the (Cu,Mo)-1232 phase the c-axis lattice parameter gradually decreases and Tc increases. The highest T c value of 53 K reached for samples oxygenated in the presence of 100 mol\% Ag2O2 exceeds the values reported for Cu-based two-fluorite-layer compounds.",

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AU - Nagai, T.

AU - Matsui, Y.

AU - Yamauchi, H.

AU - Karppinen, M.

PY - 2004/11/1

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N2 - We have synthesized high-quality samples of the s=3 member of the (Cu,Mo)-12s2 homologous series of layered copper oxides. The (Cu,Mo)-1232 phase forms as a single phase for the cation composition (Cu0.75Mo 0.25)Sr2(Ce0.67 Y0.33) 3Cu2O11+δ through solid-state synthesis in air, but the samples as synthesized are not superconductive. Superconductivity is induced in the air-synthesized samples by means of high-pressure oxygenation carried out at 5 GPa and 500°C in the presence of Ag2O2 as an excess oxygen source. With increasing ratio of Ag2O2 to the (Cu,Mo)-1232 phase the c-axis lattice parameter gradually decreases and Tc increases. The highest T c value of 53 K reached for samples oxygenated in the presence of 100 mol% Ag2O2 exceeds the values reported for Cu-based two-fluorite-layer compounds.

AB - We have synthesized high-quality samples of the s=3 member of the (Cu,Mo)-12s2 homologous series of layered copper oxides. The (Cu,Mo)-1232 phase forms as a single phase for the cation composition (Cu0.75Mo 0.25)Sr2(Ce0.67 Y0.33) 3Cu2O11+δ through solid-state synthesis in air, but the samples as synthesized are not superconductive. Superconductivity is induced in the air-synthesized samples by means of high-pressure oxygenation carried out at 5 GPa and 500°C in the presence of Ag2O2 as an excess oxygen source. With increasing ratio of Ag2O2 to the (Cu,Mo)-1232 phase the c-axis lattice parameter gradually decreases and Tc increases. The highest T c value of 53 K reached for samples oxygenated in the presence of 100 mol% Ag2O2 exceeds the values reported for Cu-based two-fluorite-layer compounds.

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High-T_c superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr₂(Ce,Y)₃Cu₂O_11+δ

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