Diamondlike carbon (DLC) films were directly deposited onto germanium (Ge) and zinc sulphide (ZnS) slices by a capacitively coupled 13.56 MHz rf glow discharge plasma with Ar-C2H2 gas mixtures. The IR transmittance was measured using a Fourier-transform infrared spectrometer. The maximum values of the IR transmission of Ge and ZnS with DLC films on both sides are 99% and 95.8%, respectively, which come up to the theoretical values. A nonuniform DLC film, of which the refractive index gradually changes along the thickness, has been successfully deposited onto a Ge slice for the first time and the IR transmission of a nonuniform DLC film coated onto both sides of a Ge substrate at the wider wave band of 2.5–15 μm is over 85%.
The Sm-doping YBCO films, Y 1−x Sm x Ba 2 -Cu 3 O y and Y 1 Sm x Ba 2−x Cu 3 O y (x = 0.1, 0.3), were fabricated on LAO (00l) single-crystal substrates by TFA-MOD process in order to improve the superconducting properties of YBCO films. The XRD analyses indicated that these samples have a strong c-axis texture, but the secondary phase of BaCuO 2 are found from Y 1 Sm x Ba 2−x Cu 3 O y films with Sm 3+ substitution on Ba 2+ sites. High quality surface, better in-plane and out-of-plane texture of the Sm-doping films have been obtained compared with that of the undoped YBCO film. The Y 0.9 Sm 0.1 Ba 2 Cu 3 O y films showed the highest value of T c and J c in self-field. Superconducting properties of all Sm-doping films are better than those of the pure film. These results strongly suggest that Smsubstitution on Y or Ba sites of YBCO phase is a powerful method to efficiently improve J c and introduce artificial pinning centers in YBCO films.
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