Preparation of superconductive (BaMOx)(BaCuO2+y)(CaCuO2)n artificial lattices (M = Au, Cu; n = 2, 4) by laser molecular beam epitaxy
✍ Scribed by Shuuiti Matunari; Masaki Kanai; Tomoji Kawai
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 672 KB
- Volume
- 253
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
BaCuO2+y)2(CaCuO2) n artificial lattices have been grown by an atomic layer-by-layer deposition technique with laser molecular beam epitaxy. The experimental results show that the interface stress and the charge balance are the controlling factors for the formation of the artificial lattices. To avoid interface irregularities, growth control by the all atomic layer-by-layer deposition is preferable to the partial atomic layer-by-layer deposition combined with co-deposition. The (Bao.7Sro.3CuOz+y)z(Cao.7Sro.3CuO2) 4 lattices where Ba and Ca sites are substituted by an Sr ion to decrease the interface stress have been formed by all atomic layer-by-layer deposition, and (BaAuOx)(BaCuOz+y)(CaCuO2) 2 lattices, where the Cu site between adjacent BaO layers is replaced by Au, have also been formed by the same method. The (Bao.vSro.3CuOz+y)z(Cao.7Sro.3CuOz) 4 lattice shows a resistive anomaly below 110 K, where the resistance depends on the magnetic field. The (BaAuOx)(BaCuO 2 +y)(CaCuO2) 2 lattice shows zero resistance at 20 K with an onset temperature of 60 K.