Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ

Ayako Yamamoto; Wei Zhi Hu; Fujio Izumi; Takashi Kamiyama; Setsuko Tajima

doi:10.1023/a:1022565832711

Effects of Carbonate Defects on the Superconductivity of HgBa₂CuO_4+δ

Ayako Yamamoto, Wei Zhi Hu, Fujio Izumi, Takashi Kamiyama, Setsuko Tajima

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

8 Citations (Scopus)

Abstract

Carbon contents in HgBa₂CuO_4+δ and starting materials (HgO, BaO, and CuO) for preparing it were determined by infrared spectroscopy to examine influences of CO₃^2- ions substituted for [HgO₂]^2- groups on its superconducting properties. Measurements of DC magnetic susceptibilities and resistivities revealed that superconducting transition in an oxygen-annealed sample with a minimum C content of 0.88 mol% was very sharp with T_c 's of 98.0 K (negative magnetization) and 96.5 K (zero resistance), respectively. They are the highest T_c 's that have ever been attained in HgBa₂CuO_4+δ including single crystals. Structural data obtained by neutron powder diffraction showed our sample to have high quality and a δ value of 0.122(5).

Original language	English
Pages (from-to)	789-793
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	117
Issue number	3-4
DOIs	https://doi.org/10.1023/a:1022565832711
Publication status	Published - 1999
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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title = "Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ",

abstract = "Carbon contents in HgBa2CuO4+δ and starting materials (HgO, BaO, and CuO) for preparing it were determined by infrared spectroscopy to examine influences of CO32- ions substituted for [HgO2]2- groups on its superconducting properties. Measurements of DC magnetic susceptibilities and resistivities revealed that superconducting transition in an oxygen-annealed sample with a minimum C content of 0.88 mol% was very sharp with Tc 's of 98.0 K (negative magnetization) and 96.5 K (zero resistance), respectively. They are the highest Tc 's that have ever been attained in HgBa2CuO4+δ including single crystals. Structural data obtained by neutron powder diffraction showed our sample to have high quality and a δ value of 0.122(5).",

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T1 - Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ

AU - Yamamoto, Ayako

AU - Hu, Wei Zhi

AU - Izumi, Fujio

AU - Kamiyama, Takashi

AU - Tajima, Setsuko

PY - 1999

Y1 - 1999

N2 - Carbon contents in HgBa2CuO4+δ and starting materials (HgO, BaO, and CuO) for preparing it were determined by infrared spectroscopy to examine influences of CO32- ions substituted for [HgO2]2- groups on its superconducting properties. Measurements of DC magnetic susceptibilities and resistivities revealed that superconducting transition in an oxygen-annealed sample with a minimum C content of 0.88 mol% was very sharp with Tc 's of 98.0 K (negative magnetization) and 96.5 K (zero resistance), respectively. They are the highest Tc 's that have ever been attained in HgBa2CuO4+δ including single crystals. Structural data obtained by neutron powder diffraction showed our sample to have high quality and a δ value of 0.122(5).

AB - Carbon contents in HgBa2CuO4+δ and starting materials (HgO, BaO, and CuO) for preparing it were determined by infrared spectroscopy to examine influences of CO32- ions substituted for [HgO2]2- groups on its superconducting properties. Measurements of DC magnetic susceptibilities and resistivities revealed that superconducting transition in an oxygen-annealed sample with a minimum C content of 0.88 mol% was very sharp with Tc 's of 98.0 K (negative magnetization) and 96.5 K (zero resistance), respectively. They are the highest Tc 's that have ever been attained in HgBa2CuO4+δ including single crystals. Structural data obtained by neutron powder diffraction showed our sample to have high quality and a δ value of 0.122(5).

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Effects of Carbonate Defects on the Superconductivity of HgBa₂CuO_4+δ

Abstract

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