Hole concentration in the three-CuO2-plane copper-oxide superconductor Cu-1223

M. Karppinen; Hisao Yamauchi; Y. Morita; M. Kitabatake; T. Motohashi; R. S. Liu; J. M. Lee; Jinming Chen

doi:10.1016/j.jssc.2003.10.011

Hole concentration in the three-CuO₂-plane copper-oxide superconductor Cu-1223

M. Karppinen^*, Hisao Yamauchi, Y. Morita, M. Kitabatake, T. Motohashi, R. S. Liu, J. M. Lee, Jinming Chen

^*Corresponding author for this work

Not published at Aalto University

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

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Abstract

Strongly overdoped samples of the three-CuO₂-plane copper-oxide superconductor, CuBa₂Ca₂Cu₃O_8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of T_c range from 65 to 118K. A concomitant decrease in the average valence of copper from ∼2.20 to ∼2.05 was evidenced by means of wet-chemical and thermogravimetric analyses and Cu L-edge X-ray absorption near-edge structure (XANES) spectroscopy. The valence value as low as ∼2.05 that corresponds to the highest T_c (=118K) may be understood by taking into account multiple ways for holes to be distributed among the different Cu-O layers. In terms of actual chemical composition of the Cu-1223 phase, both Cu L-edge and O K-edge XANES results suggest that some portion of charge-reservoir copper atoms may have been replaced by CO, i.e., (Cu_1-xC_x)Ba ₂Ca₂Cu₃O_8+x+z. The variation range of excess oxygen was estimated at Δz≈0.3.

Original language	English
Pages (from-to)	1037-1043
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	177
Issue number	3
DOIs	https://doi.org/10.1016/j.jssc.2003.10.011
Publication status	Published - 1 Mar 2004
MoE publication type	A1 Journal article-refereed

Keywords

Cu-1223 high-T superconductor
Hole concentration
Oxygen content
Thermogravimetry
Wet-chemical analysis
XANES spectroscopy

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10.1016/j.jssc.2003.10.011

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title = "Hole concentration in the three-CuO2-plane copper-oxide superconductor Cu-1223",

abstract = "Strongly overdoped samples of the three-CuO2-plane copper-oxide superconductor, CuBa2Ca2Cu3O8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of Tc range from 65 to 118K. A concomitant decrease in the average valence of copper from ∼2.20 to ∼2.05 was evidenced by means of wet-chemical and thermogravimetric analyses and Cu L-edge X-ray absorption near-edge structure (XANES) spectroscopy. The valence value as low as ∼2.05 that corresponds to the highest Tc (=118K) may be understood by taking into account multiple ways for holes to be distributed among the different Cu-O layers. In terms of actual chemical composition of the Cu-1223 phase, both Cu L-edge and O K-edge XANES results suggest that some portion of charge-reservoir copper atoms may have been replaced by CO, i.e., (Cu1-xCx)Ba 2Ca2Cu3O8+x+z. The variation range of excess oxygen was estimated at Δz≈0.3.",

keywords = "Cu-1223 high-T superconductor, Hole concentration, Oxygen content, Thermogravimetry, Wet-chemical analysis, XANES spectroscopy",

author = "M. Karppinen and Hisao Yamauchi and Y. Morita and M. Kitabatake and T. Motohashi and Liu, {R. S.} and Lee, {J. M.} and Jinming Chen",

year = "2004",

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doi = "10.1016/j.jssc.2003.10.011",

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AU - Karppinen, M.

AU - Yamauchi, Hisao

AU - Morita, Y.

AU - Kitabatake, M.

AU - Motohashi, T.

AU - Liu, R. S.

AU - Lee, J. M.

AU - Chen, Jinming

PY - 2004/3/1

Y1 - 2004/3/1

N2 - Strongly overdoped samples of the three-CuO2-plane copper-oxide superconductor, CuBa2Ca2Cu3O8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of Tc range from 65 to 118K. A concomitant decrease in the average valence of copper from ∼2.20 to ∼2.05 was evidenced by means of wet-chemical and thermogravimetric analyses and Cu L-edge X-ray absorption near-edge structure (XANES) spectroscopy. The valence value as low as ∼2.05 that corresponds to the highest Tc (=118K) may be understood by taking into account multiple ways for holes to be distributed among the different Cu-O layers. In terms of actual chemical composition of the Cu-1223 phase, both Cu L-edge and O K-edge XANES results suggest that some portion of charge-reservoir copper atoms may have been replaced by CO, i.e., (Cu1-xCx)Ba 2Ca2Cu3O8+x+z. The variation range of excess oxygen was estimated at Δz≈0.3.

AB - Strongly overdoped samples of the three-CuO2-plane copper-oxide superconductor, CuBa2Ca2Cu3O8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of Tc range from 65 to 118K. A concomitant decrease in the average valence of copper from ∼2.20 to ∼2.05 was evidenced by means of wet-chemical and thermogravimetric analyses and Cu L-edge X-ray absorption near-edge structure (XANES) spectroscopy. The valence value as low as ∼2.05 that corresponds to the highest Tc (=118K) may be understood by taking into account multiple ways for holes to be distributed among the different Cu-O layers. In terms of actual chemical composition of the Cu-1223 phase, both Cu L-edge and O K-edge XANES results suggest that some portion of charge-reservoir copper atoms may have been replaced by CO, i.e., (Cu1-xCx)Ba 2Ca2Cu3O8+x+z. The variation range of excess oxygen was estimated at Δz≈0.3.

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Hole concentration in the three-CuO₂-plane copper-oxide superconductor Cu-1223

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