プラズマ溶融急冷法による酸化物超伝導体の作製

概要

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High T_c superconductors have been prepared using a plasma-arc melting and rapid quenching (PMQ) method. Homogeneous and dense superconductors were obtained by this method through the crystallization of a superconducting phase from an amorphous-like state. Particularly in YbBa_2Cu_3O_x, a relative density of 7.14 g/cm^3 (98% of the theoretical density 7.27 g/cm^3) and a large activation energy, 1.5 eV, which was related to the flux pinning, were realized by this method. Furthermore, the formation of insulating YbBa_2Cu_30_x films on the PMQ processed YbBa_2Cu_3O_x substrate was attempted by rf magnetron sputtering. No deterioration of the YbBa_2Cu_3O_x substrate was observed. It was found that the new method produces a dense and homogeneous high T_c superconductor for device applications.
社団法人日本セラミックス協会の論文
1991-08-01