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

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

doi:10.1143/JJAP.27.L1009

Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y_1-xca_xba₂cu₃o_yand yba_2-xla_xcu₃o_y

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

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

79 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 T_cwith 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 language	English
Pages (from-to)	L1009-L1012
Journal	Japanese Journal of Applied Physics
Volume	27
Issue number	6A
DOIs	https://doi.org/10.1143/JJAP.27.L1009
Publication status	Published - 1988 Jun
Externally published	Yes

Keywords

Oxygen annealing
Substitution effect
Superconducting oxide
Thermal analysis
Y1_xCai Ba7Cu30K
YBa2_xLaxCu30K

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.27.L1009

Cite this

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

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.",

keywords = "Oxygen annealing, Substitution effect, Superconducting oxide, Thermal analysis, Y1_xCai Ba7Cu30K, YBa2_xLaxCu30K",

author = "Ayako Tokiwa and Yasuhiko Syono and Masae Kikuchi and Reiko Suzuki and Tsuyoshi Kajitani and Norio Kobayashi and Takako Sasaki and Osamu Nakatsu and Yoshio Muto",

year = "1988",

month = jun,

doi = "10.1143/JJAP.27.L1009",

language = "English",

volume = "27",

pages = "L1009--L1012",

journal = "Japanese Journal of Applied Physics",

issn = "0021-4922",

publisher = "Japan Society of Applied Physics",

number = "6A",

}

TY - JOUR

T1 - Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy

AU - Tokiwa, 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 - 1988/6

Y1 - 1988/6

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.

KW - Oxygen annealing

KW - Substitution effect

KW - Superconducting oxide

KW - Thermal analysis

KW - Y1_xCai Ba7Cu30K

KW - YBa2_xLaxCu30K

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U2 - 10.1143/JJAP.27.L1009

DO - 10.1143/JJAP.27.L1009

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VL - 27

SP - L1009-L1012

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - 6A

ER -