Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors

Maarit Karppinen; Y. Abe; I. Grigoraviciute; J.M. Chen; R.S. Liu; H. Yamauchi

doi:10.1063/1.2431458

Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors

Maarit Karppinen, Y. Abe, I. Grigoraviciute, J.M. Chen, R.S. Liu, H. Yamauchi

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Abstract

Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and Cu L-edge x-ray absorption near-edge structure (XANES) spectroscopy data indicate that the average Cu valence remains constant, whereas Tc increases with decreasing size of the R constituent. An explanation for this trend is revealed from O K-edge XANES spectra, which show that the smaller-for-larger R-cation substitution results in a shift of holes from the Cu2O2 charge reservoir to the superconductive CuO2 planes. Since Cu2Ba2RCu2O8 samples are underdoped, such a shift of holes raises the value of Tc.

Original language	English
Article number	032511
Pages (from-to)	1-3
Journal	Applied Physics Letters
Volume	90
Issue number	3
DOIs	https://doi.org/10.1063/1.2431458
Publication status	Published - 2007
MoE publication type	A1 Journal article-refereed

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title = "Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors",

abstract = "Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and Cu L-edge x-ray absorption near-edge structure (XANES) spectroscopy data indicate that the average Cu valence remains constant, whereas Tc increases with decreasing size of the R constituent. An explanation for this trend is revealed from O K-edge XANES spectra, which show that the smaller-for-larger R-cation substitution results in a shift of holes from the Cu2O2 charge reservoir to the superconductive CuO2 planes. Since Cu2Ba2RCu2O8 samples are underdoped, such a shift of holes raises the value of Tc.",

author = "Maarit Karppinen and Y. Abe and I. Grigoraviciute and J.M. Chen and R.S. Liu and H. Yamauchi",

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T1 - Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors

AU - Karppinen, Maarit

AU - Abe, Y.

AU - Grigoraviciute, I.

AU - Chen, J.M.

AU - Liu, R.S.

AU - Yamauchi, H.

PY - 2007

Y1 - 2007

N2 - Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and Cu L-edge x-ray absorption near-edge structure (XANES) spectroscopy data indicate that the average Cu valence remains constant, whereas Tc increases with decreasing size of the R constituent. An explanation for this trend is revealed from O K-edge XANES spectra, which show that the smaller-for-larger R-cation substitution results in a shift of holes from the Cu2O2 charge reservoir to the superconductive CuO2 planes. Since Cu2Ba2RCu2O8 samples are underdoped, such a shift of holes raises the value of Tc.

AB - Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and Cu L-edge x-ray absorption near-edge structure (XANES) spectroscopy data indicate that the average Cu valence remains constant, whereas Tc increases with decreasing size of the R constituent. An explanation for this trend is revealed from O K-edge XANES spectra, which show that the smaller-for-larger R-cation substitution results in a shift of holes from the Cu2O2 charge reservoir to the superconductive CuO2 planes. Since Cu2Ba2RCu2O8 samples are underdoped, such a shift of holes raises the value of Tc.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors

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