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Superconducting Bi-Sr-Ca-Cu-0 ultrathin films with thicknesses of 300, 150, 70 and 40 A were synthesized by using singletarget magnetron sputtering and by optimizing the heat treatment conditions. Ultrathin films thus obtained were highly oriented with the c axis perpendicular to the film plane. These film specimens were irradiated with 100 keV Ar ions at low temperatures, lo-20 K, and subsequently annealed at a relatively low temperature around 730 "C. For a film thickness of 300 A, the zeroresistance transition temperature T,,, was raised to 108 K, which is equivalent to the maximum value so far observed for the bulk system. The critical current density J, was lo4 A cm-' at 77 K in zero magnetic field. Even for 40 w thick ultrathin film, the initial T,,, of 78 K was improved to 88 K, approaching T,., of the high T, phase with a significant increase in J, of the order of lo3 A cm-' at 77 K. The role of 100 keV range Ar ions in the thin film modification was discussed in terms of a selective creation of "unit cell" scales of the low energy collision cascades and ion channelling in thin crystalline films.

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Author

Masatsugu Kaise; Kazuo Saito

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)

Published

1996

Language

EN

Field

Engineering (Physical Sciences)