Details

Autor(en) / Beteiligte

• Werder, D J
• Chen, C H
• Cava, R J
• Batlogg, B

Titel

Oxygen-Vacancy Ordering and Microstructure in Annealed Ba sub 2 YCu sub 3 O sub 7-- delta Superconductors

Ist Teil von

• Physical review. B, Condensed matter, 1988-09, Vol.38 (7), p.5130-5133

Erscheinungsjahr

1988

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• The results of a systematic electron diffraction study of short-range oxygen-vacancy ordering in ceramic Ba sub 2 YCu sub 3 O sub 7-- delta superconductors with 0.08 < = delta < = 0.67, prepared by a Zr-getter technique are presented. In addition to the two types of orderings with reduced wave vectors (1/2,0,0) and (2/5,0,0), a new vacancy ordering with reduced wave vector (1 /3,0,0) has been found. A vacancy ordering with a large correlation length ( approx 150 A) in the c-axis direction has been observed in samples with delta = 0.5. A tweed-like microstructure at delta = 0.61 was also observed, which is caused by a high density of microtwins. 15 ref.--AA