By Maurice H. Francombe
Following within the long-standing culture of excellence confirmed via this serial, this quantity presents a centred examine modern purposes. excessive Tc superconducting skinny motion pictures are mentioned when it comes to ion beam and sputtering deposition, vacuum evaporation, laser ablation, MOCVD, and different deposition techniques as well as their final functions. special therapy can be given to everlasting magnet skinny movies, lateral diffusion and electromigration in metal skinny movies, and fracture and cracking phenomena in skinny movies adhering to high-elongation substrates
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Extra info for Thin Films for Emerging Applications
Cnr and 1 χ 10 A/cm CO c were measured for 1,000 Â films at 75 Κ and 70 K, respectively. The respective parameters for thinner samples were Γ οof 89 Κ, ρ (100 Κ) of 70 μΩ in the case of a 500 Â film, and Tcoof 70 Κ for an ultrathin (90 Â) film. Johnson and co-workers (250,251) have grown in situ Y B a 2C u 30 7cjand D y B a 2C u 30 7x thin films with Tcoof 85 Κ on a variety of substrates at a 7 nominal temperature of 730°C by co-evaporation of metallic constituents from BN Knudsen cells in ozone partial pressure of 2 x 1 0 Torr.
G. DHERE of the lack of understanding of the kinetics of phase formation of Bi-based superconductors and the optimum conditions for their oxygenation. Wasa and co-workers (157,158) have prepared B i - S r - C a - C u - 0 superconducting thin films by magnetron sputtering from a composite oxide target on MgO substrates heated to ~800°C together with an enhanced ion bombardment. As-grown films showed a broad transition around 80 Κ with a AT of 40-50 K. c Dhere et al. 25-1 μιη, B i - S r - C a - C u - 0 thin films on (100) MgO substrates.
G. DHERE cation from a refractory metal crucible. , Y. Ε-guns may be used as 4 universal sources for evaporating almost all materials. A hot tungsten filament forms a volatile oxide at oxygen partial pressures above ~10" Torr, and hence its useful life is reduced drastically at high oxygen partial pressures, which are necessary for the deposition of high-Γ superconducting oxides. The problem of source-evaporant interaction and reduced resistance may be overcome by a proper choice of a crucible or coating and cooling.
Thin Films for Emerging Applications by Maurice H. Francombe