Electric-current-stimulated diffusion of heavy ions and oxygen in YBCO (123) and Bi (2223) HTCS films at 4.2-300 K

Авторы: Lubnin E.N., Mikhailova G.N., Prokhorov A.M., Seferov A.S., Troitskii A.V., Andrianov D.G., Klimonskii S.O.
Сборник: LASER METHODS OF SURFACE TREATMENT AND MODIFICATION, ALT 94 INTERNATIONAL CONFERENCE
Серия: PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
Том: 2498
Год издания: 1995
Первая страница: 115
Последняя страница: 125
Аннотация: The results of the study of electrostimulated diffusion in polycrystalline and epitaxial YBCO (123 ) and ceramic Bi (2223 ) HTCS films give evidence of the motion of heavy ions and oxygen under the transport superconducting current flow. Long —duration d.c. flowing in films in the superconducting state at 4.2 and 77 K leads to new morphological forms with modified chemical composition, formation of nonsuperconducting phases. The effect in the high —quality epitaxial films exists, but it is weaker. Long —duration flowing of high —power 36 GHz current leads to formation of periodic strip structures enriched with copper and oxygen. The experiments with thick (25 tm ) Bi (2223) films reveal modified stoichiometry practically over the entire film. At 300 K the YBCO (123) system is shown to have the ionic conduction component. Possible mechanisms of the observed experimental effects are discussed.
Добавил в систему: Климонский Сергей Олегович

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