Dependence of Tc on hole concentration in HgBa2CuO4+δ

Q. Xiong; Y. Y. Xue; Y. Cao; F. Chen; J. Gibson; L. M. Liu; A. Jacobson; C. W. Chu

doi:10.1016/0921-4534(95)00409-2

Dependence of T_c on hole concentration in HgBa₂CuO_4+δ

Q. Xiong, Y. Y. Xue, Y. Cao, F. Chen, J. Gibson, L. M. Liu, A. Jacobson, C. W. Chu

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Abstract

HgBa₂CuO_4+δ (Hg1201) samples with 0.03 ≤ δ ≤ 0.4 have been obtained. The oxygen surplus δ was calculated from thermogravimetric analysis and compared with neutron powder diffraction data. The hole concentration p_s has been estimated based on thermoelectric power and verified by bond-valence summation. While T_c changes with both p_s and δ parabolically over most of the doping range, p_s ≪ 2 δ, suggesting a complicated electric band structure of Hg1201. It was also observed that the magnetization χ of powdered samples decreases with δ in the overdoped region, suggesting a decrease of n_s/m^* with oxidation, as that reported in overdoped Tl2201 and Tl1201.

Original language	English
Pages (from-to)	216-218
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	251
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(95)00409-2
Publication status	Published - 1995 Sep 15

All Science Journal Classification (ASJC) codes

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

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10.1016/0921-4534(95)00409-2

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@article{a103d62f476846389f865dc519da510a,

title = "Dependence of Tc on hole concentration in HgBa2CuO4+δ",

abstract = "HgBa2CuO4+δ (Hg1201) samples with 0.03 ≤ δ ≤ 0.4 have been obtained. The oxygen surplus δ was calculated from thermogravimetric analysis and compared with neutron powder diffraction data. The hole concentration ps has been estimated based on thermoelectric power and verified by bond-valence summation. While Tc changes with both ps and δ parabolically over most of the doping range, ps ≪ 2 δ, suggesting a complicated electric band structure of Hg1201. It was also observed that the magnetization χ of powdered samples decreases with δ in the overdoped region, suggesting a decrease of ns/m* with oxidation, as that reported in overdoped Tl2201 and Tl1201.",

author = "Q. Xiong and Xue, {Y. Y.} and Y. Cao and F. Chen and J. Gibson and Liu, {L. M.} and A. Jacobson and Chu, {C. W.}",

note = "Funding Information: This work is supported by NSF Grant No. DMR 91-22043, NASA Grant No. NAGW-977, Texas Center for Superconductivity at the University of Houston, and the T.L.L. Temple Foundation.",

year = "1995",

month = sep,

day = "15",

doi = "10.1016/0921-4534(95)00409-2",

language = "English",

volume = "251",

pages = "216--218",

journal = "Physica C: Superconductivity and its Applications",

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publisher = "Elsevier",

number = "3-4",

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T1 - Dependence of Tc on hole concentration in HgBa2CuO4+δ

AU - Xiong, Q.

AU - Xue, Y. Y.

AU - Cao, Y.

AU - Chen, F.

AU - Gibson, J.

AU - Liu, L. M.

AU - Jacobson, A.

AU - Chu, C. W.

N1 - Funding Information: This work is supported by NSF Grant No. DMR 91-22043, NASA Grant No. NAGW-977, Texas Center for Superconductivity at the University of Houston, and the T.L.L. Temple Foundation.

PY - 1995/9/15

Y1 - 1995/9/15

N2 - HgBa2CuO4+δ (Hg1201) samples with 0.03 ≤ δ ≤ 0.4 have been obtained. The oxygen surplus δ was calculated from thermogravimetric analysis and compared with neutron powder diffraction data. The hole concentration ps has been estimated based on thermoelectric power and verified by bond-valence summation. While Tc changes with both ps and δ parabolically over most of the doping range, ps ≪ 2 δ, suggesting a complicated electric band structure of Hg1201. It was also observed that the magnetization χ of powdered samples decreases with δ in the overdoped region, suggesting a decrease of ns/m* with oxidation, as that reported in overdoped Tl2201 and Tl1201.

AB - HgBa2CuO4+δ (Hg1201) samples with 0.03 ≤ δ ≤ 0.4 have been obtained. The oxygen surplus δ was calculated from thermogravimetric analysis and compared with neutron powder diffraction data. The hole concentration ps has been estimated based on thermoelectric power and verified by bond-valence summation. While Tc changes with both ps and δ parabolically over most of the doping range, ps ≪ 2 δ, suggesting a complicated electric band structure of Hg1201. It was also observed that the magnetization χ of powdered samples decreases with δ in the overdoped region, suggesting a decrease of ns/m* with oxidation, as that reported in overdoped Tl2201 and Tl1201.

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EP - 218

JO - Physica C: Superconductivity and its Applications

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SN - 0921-4534

IS - 3-4

ER -

Dependence of T_c on hole concentration in HgBa₂CuO_4+δ

Abstract

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