Superconductivity of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 0.8) with a wide range of doping state

Ayako Tokiwa-Yamamoto; Tadashi Tatsuki; Seiji Adachi; Keiichi Tanabe

doi:10.1016/0921-4534(96)00414-5

Superconductivity of (Hg_0.7Tl_0.3)₂Ba₂Y _1-xCa_xCu₂O_8-δ (0 ≦ x ≦ 0.8) with a wide range of doping state

Ayako Tokiwa-Yamamoto, Tadashi Tatsuki, Seiji Adachi, Keiichi Tanabe

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

19 Citations (Scopus)

Abstract

(Hg,Tl)-based cuprates with the nominal compositions of (Hg_0.7Tl_0.3)₂Ba₂Y _1-xCa_xCu₂O_8-δ (0 ≦ x ≦ 1.0, every 0.1 step) were prepared under high pressure, and nearly single phases were obtained for the samples with 0 ≦ x ≦ 0.8. We systematically investigated their unit cell dimensions, DC susceptibility, electrical resistivity, oxygen content and copper valence as a function of Ca content, x. For the samples with x = 0-0.4, T_c, which was determined by DC susceptibility, increased from 12 K to 84 K with increasing x, while the samples with x = 0.5-0.8 exhibited a T_c decrease from 84 K to 40 K. This result indicates that the doping state of the samples can be extensively varied from underdoped to overdoped states by the Ca substitution. This variation in the doping states was also supported by the systematic change in the temperature dependence of the electrical resistivity. Oxygen analysis revealed that the copper valence gradually increased from 2.12 to 2.26 with increasing x from 0 to 0.8. The copper valence with the maximum T_c of 84 K in these samples was determined to be 2.18-2.19, which is comparable to the value for the optimum T_c in other high-T_c cuprates.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	268
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(96)00414-5
Publication status	Published - 1996 Sept 10
Externally published	Yes

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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10.1016/0921-4534(96)00414-5

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title = "Superconductivity of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 0.8) with a wide range of doping state",

abstract = "(Hg,Tl)-based cuprates with the nominal compositions of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 1.0, every 0.1 step) were prepared under high pressure, and nearly single phases were obtained for the samples with 0 ≦ x ≦ 0.8. We systematically investigated their unit cell dimensions, DC susceptibility, electrical resistivity, oxygen content and copper valence as a function of Ca content, x. For the samples with x = 0-0.4, Tc, which was determined by DC susceptibility, increased from 12 K to 84 K with increasing x, while the samples with x = 0.5-0.8 exhibited a Tc decrease from 84 K to 40 K. This result indicates that the doping state of the samples can be extensively varied from underdoped to overdoped states by the Ca substitution. This variation in the doping states was also supported by the systematic change in the temperature dependence of the electrical resistivity. Oxygen analysis revealed that the copper valence gradually increased from 2.12 to 2.26 with increasing x from 0 to 0.8. The copper valence with the maximum Tc of 84 K in these samples was determined to be 2.18-2.19, which is comparable to the value for the optimum Tc in other high-Tc cuprates.",

author = "Ayako Tokiwa-Yamamoto and Tadashi Tatsuki and Seiji Adachi and Keiichi Tanabe",

note = "Funding Information: This work was supported by NEDO for the R&D of Industrial Science and Technology Frontier Program.",

year = "1996",

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doi = "10.1016/0921-4534(96)00414-5",

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pages = "191--196",

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

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T1 - Superconductivity of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 0.8) with a wide range of doping state

AU - Tokiwa-Yamamoto, Ayako

AU - Tatsuki, Tadashi

AU - Adachi, Seiji

AU - Tanabe, Keiichi

N1 - Funding Information: This work was supported by NEDO for the R&D of Industrial Science and Technology Frontier Program.

PY - 1996/9/10

Y1 - 1996/9/10

N2 - (Hg,Tl)-based cuprates with the nominal compositions of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 1.0, every 0.1 step) were prepared under high pressure, and nearly single phases were obtained for the samples with 0 ≦ x ≦ 0.8. We systematically investigated their unit cell dimensions, DC susceptibility, electrical resistivity, oxygen content and copper valence as a function of Ca content, x. For the samples with x = 0-0.4, Tc, which was determined by DC susceptibility, increased from 12 K to 84 K with increasing x, while the samples with x = 0.5-0.8 exhibited a Tc decrease from 84 K to 40 K. This result indicates that the doping state of the samples can be extensively varied from underdoped to overdoped states by the Ca substitution. This variation in the doping states was also supported by the systematic change in the temperature dependence of the electrical resistivity. Oxygen analysis revealed that the copper valence gradually increased from 2.12 to 2.26 with increasing x from 0 to 0.8. The copper valence with the maximum Tc of 84 K in these samples was determined to be 2.18-2.19, which is comparable to the value for the optimum Tc in other high-Tc cuprates.

AB - (Hg,Tl)-based cuprates with the nominal compositions of (Hg0.7Tl0.3)2Ba2Y 1-xCaxCu2O8-δ (0 ≦ x ≦ 1.0, every 0.1 step) were prepared under high pressure, and nearly single phases were obtained for the samples with 0 ≦ x ≦ 0.8. We systematically investigated their unit cell dimensions, DC susceptibility, electrical resistivity, oxygen content and copper valence as a function of Ca content, x. For the samples with x = 0-0.4, Tc, which was determined by DC susceptibility, increased from 12 K to 84 K with increasing x, while the samples with x = 0.5-0.8 exhibited a Tc decrease from 84 K to 40 K. This result indicates that the doping state of the samples can be extensively varied from underdoped to overdoped states by the Ca substitution. This variation in the doping states was also supported by the systematic change in the temperature dependence of the electrical resistivity. Oxygen analysis revealed that the copper valence gradually increased from 2.12 to 2.26 with increasing x from 0 to 0.8. The copper valence with the maximum Tc of 84 K in these samples was determined to be 2.18-2.19, which is comparable to the value for the optimum Tc in other high-Tc cuprates.

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Superconductivity of (Hg_0.7Tl_0.3)₂Ba₂Y _1-xCa_xCu₂O_8-δ (0 ≦ x ≦ 0.8) with a wide range of doping state

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