Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 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 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).

Original languageEnglish
Pages (from-to)789-793
Number of pages5
JournalJournal of Low Temperature Physics
Volume117
Issue number3-4
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Neutron powder diffraction
Carbonates
Superconductivity
Magnetic susceptibility
Infrared spectroscopy
Magnetization
carbonates
Carbon
superconductivity
Single crystals
Ions
Oxygen
Defects
defects
direct current
infrared spectroscopy
magnetic permeability
neutrons
magnetization
electrical resistivity

ASJC Scopus subject areas

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

Cite this

Yamamoto, A., Hu, W. Z., Izumi, F., Kamiyama, T., & Tajima, S. (1999). Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ Journal of Low Temperature Physics, 117(3-4), 789-793.

Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ . / Yamamoto, Ayako; Hu, Wei Zhi; Izumi, Fujio; Kamiyama, Takashi; Tajima, Setsuko.

In: Journal of Low Temperature Physics, Vol. 117, No. 3-4, 1999, p. 789-793.

Research output: Contribution to journalArticle

Yamamoto, A, Hu, WZ, Izumi, F, Kamiyama, T & Tajima, S 1999, 'Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ ', Journal of Low Temperature Physics, vol. 117, no. 3-4, pp. 789-793.
Yamamoto, Ayako ; Hu, Wei Zhi ; Izumi, Fujio ; Kamiyama, Takashi ; Tajima, Setsuko. / Effects of Carbonate Defects on the Superconductivity of HgBa2CuO4+δ In: Journal of Low Temperature Physics. 1999 ; Vol. 117, No. 3-4. pp. 789-793.
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