Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ

A. Fukuoka, Ayako Yamamoto, M. Itoh, R. Usami, S. Adachi, H. Yamauchi, K. Tanabe

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

We have synthesized nearly single-phase HgBa2CuO4+δ samples with various oxygen contents, and systematically investigated the relationship between the lattice parameters, the superconductivity transition temperature (Tc) and the oxygen content determined by iodometry. Furthermore, the nominal copper valence values were calculated from the oxygen content data by assuming constant valence values of +2.00 and -2.00 for mercury and oxygen, respectively. Both the a and c lattice parameters were found to decrease monotonically with the Cu valence over a wide range of +2.05-2.28. The obtained Tc versus Cu valence curve exhibits a "bell shaped" correlation with the maximum in Tc at the Cu valence of ∼ +2.18.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume265
Issue number1-2
Publication statusPublished - 1996 Jul 1
Externally publishedYes

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Oxygen
valence
Lattice constants
oxygen
lattice parameters
Superconductivity
Mercury
Superconducting transition temperature
Copper
bells
superconductivity
transition temperature
copper
curves

ASJC Scopus subject areas

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

Cite this

Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ . / Fukuoka, A.; Yamamoto, Ayako; Itoh, M.; Usami, R.; Adachi, S.; Yamauchi, H.; Tanabe, K.

In: Physica C: Superconductivity and its Applications, Vol. 265, No. 1-2, 01.07.1996, p. 13-18.

Research output: Contribution to journalArticle

Fukuoka, A. ; Yamamoto, Ayako ; Itoh, M. ; Usami, R. ; Adachi, S. ; Yamauchi, H. ; Tanabe, K. / Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ In: Physica C: Superconductivity and its Applications. 1996 ; Vol. 265, No. 1-2. pp. 13-18.
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