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✦   LIBER   ✦

Structural and superconducting properties of cuprates in the YSr2Cu3Oy−GaSr2YCu2Oy system

✍ Scribed by Seiji Adachi; Satoshi Takano; H. Yamauchi

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
228 KB
Volume
196
Category
Article
ISSN
0921-4534

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✦ Synopsis

The crystal structure and superconducting properties of cuprates in the YSr2Cu3Oy-GaSr2YCu2Oy system were investigated. The ceramic samples of compositions YSr2Cu3_xGaxOy (x= 0.0-1.0 ) were prepared in flowing oxygen gas. Single-phase samples were obtained for x= 0.4-1.0. The crystal structure for compounds with x= 0.4-0.7 was tetragonal and that for compounds with x=0.8-1.0 orthorhombic. The Cu-Cu distance in the Cu-O2 sheet increased linearly with increasing x, although a tetragonalorthorhombic phase transition occurred. Superconductivity did not occur for as-sintered samples. The sintered samples were annealed in a high-pressure oxygen gas. Through this annealing, YSr2Cu2.6Gao 40; exhibited superconductivity with a transition temperature of ~ 10 K.

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