酸化物高温超伝導体YBa_2Cu_3O_χの結晶成長に関する一考察

概要

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Single crystals of oxide superconductor YBa_2Cu_3O_χ have successfully been grown using a slow cooling method where a slight excess of CuO is used in order to make a partial melting condition. Two types of crystals are obtained: block crystals with the aspect ratio of about 0.5, and flake ones with that of about 0.1. The former displays a sharp transition m superconductivity above 90 K, whereas the latter shows a gradual one below 60 K. The former crystals are thought to be made in a condition that solid and liquid phase coexist and a peritectic reaction plays a main role. On the other hand, the latter crystals may be grown under a solution growth condition. Growth condition and mechanism are discussed using the results of microscope observation, SEM-EPMA and quenching experiments.
日本結晶成長学会の論文
1988-02-25