Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy

Ayako Yamamoto, Yasuhiko Syono, Masae Kikuchi, Reiko Suzuki, Tsuyoshi Kajitani, Norio Kobayashi, Takako Sasaki, Osamu Nakatsu, Yoshio Muto

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

The effects of Ca2+substitution for Y3+and La3+substitution for Ba2+in YBa2Cu3O7on the structural and superconducting properties were studied to control the average copper charge. Single-phase tripled perovskites were obtained for 0≦x≦0.2 and 0≦x≦1.0 for Ca and La doped series, respectively. A slight decrease of Tcwith increasing x was found for small x values for both kinds of substituted specimens prepared by furnace cooling in air. Oxygen annealing experiments were also carried out. These suggested that the superconduction in the Y-Ba-Cu-O system cannot be interpreted only by oxygen content or average copper charge.

Original languageEnglish
Pages (from-to)L1009-L1012
JournalJapanese Journal of Applied Physics
Volume27
Issue number6A
DOIs
Publication statusPublished - 1988
Externally publishedYes

Fingerprint

Superconductivity
Substitution reactions
superconductivity
Crystal structure
Positive ions
Annealing
substitutes
Copper
cations
copper
crystal structure
annealing
Oxygen
oxygen
perovskites
furnaces
Furnaces
Cooling
cooling
air

Keywords

  • Oxygen annealing
  • Substitution effect
  • Superconducting oxide
  • Thermal analysis
  • Y1_xCai Ba7Cu30K
  • YBa2_xLaxCu30K

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy . / Yamamoto, Ayako; Syono, Yasuhiko; Kikuchi, Masae; Suzuki, Reiko; Kajitani, Tsuyoshi; Kobayashi, Norio; Sasaki, Takako; Nakatsu, Osamu; Muto, Yoshio.

In: Japanese Journal of Applied Physics, Vol. 27, No. 6A, 1988, p. L1009-L1012.

Research output: Contribution to journalArticle

Yamamoto, Ayako ; Syono, Yasuhiko ; Kikuchi, Masae ; Suzuki, Reiko ; Kajitani, Tsuyoshi ; Kobayashi, Norio ; Sasaki, Takako ; Nakatsu, Osamu ; Muto, Yoshio. / Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy In: Japanese Journal of Applied Physics. 1988 ; Vol. 27, No. 6A. pp. L1009-L1012.
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T1 - Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy

AU - Yamamoto, Ayako

AU - Syono, Yasuhiko

AU - Kikuchi, Masae

AU - Suzuki, Reiko

AU - Kajitani, Tsuyoshi

AU - Kobayashi, Norio

AU - Sasaki, Takako

AU - Nakatsu, Osamu

AU - Muto, Yoshio

PY - 1988

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N2 - The effects of Ca2+substitution for Y3+and La3+substitution for Ba2+in YBa2Cu3O7on the structural and superconducting properties were studied to control the average copper charge. Single-phase tripled perovskites were obtained for 0≦x≦0.2 and 0≦x≦1.0 for Ca and La doped series, respectively. A slight decrease of Tcwith increasing x was found for small x values for both kinds of substituted specimens prepared by furnace cooling in air. Oxygen annealing experiments were also carried out. These suggested that the superconduction in the Y-Ba-Cu-O system cannot be interpreted only by oxygen content or average copper charge.

AB - The effects of Ca2+substitution for Y3+and La3+substitution for Ba2+in YBa2Cu3O7on the structural and superconducting properties were studied to control the average copper charge. Single-phase tripled perovskites were obtained for 0≦x≦0.2 and 0≦x≦1.0 for Ca and La doped series, respectively. A slight decrease of Tcwith increasing x was found for small x values for both kinds of substituted specimens prepared by furnace cooling in air. Oxygen annealing experiments were also carried out. These suggested that the superconduction in the Y-Ba-Cu-O system cannot be interpreted only by oxygen content or average copper charge.

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KW - Y1_xCai Ba7Cu30K

KW - YBa2_xLaxCu30K

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