Evidence for pinning by (Sr,Ca)2CuOy particles in partial-melting processed bulk Bi2Sr2CaCu2O8+δ ceramics期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Evidence for pinning by (Sr,Ca)₂CuO_y particles in partial-melting processed bulk Bi₂Sr₂CaCu₂O_8+δ ceramics

Authors:	M R Koblischka S L Huang K Fossheim T H Johansen H Bratsberg

Institution:	^a Department of Physics, Norwegian University of Science and Technology, N-7034 Trondheim, Norway ^b Department of Physics, University of Oslo, N-0316 Oslo, Norway

Abstract:	Flux distributions of partial-melting processed Bi₂Sr₂CaCu₂O_8+δ ceramics are obtained using magneto-optic imaging. In remanent states (μ₀H_a=0 T), large amounts of trapped flux are observed along (Sr,Ca)₂CuO_y particles embedded in the Bi₂Sr₂CaCu₂O_8+δ matrix. Despite the relatively large size of these particles (up to 30 μm), the pinning effect is similar to that of Y₂BaCuO₅ particles in melt-processed YBa₂Cu₃O_7?δ. Furthermore, we discuss how the pinning capability of non-superconducting particles of different sizes and densities will show up in magneto-optic images.

Keywords:	Oxide superconductors Ceramic materials Melting Magnetooptical effects Particle size analysis Bismuth compounds Pinning effects Magneto optic imaging
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