The structure and superconducting properties of sputtered Nb-Ta multilayers are studied as a function of the bilayer period {Λ}. The films are mosaic structures with single-crystal diffraction profiles. The elastic mean free paths in both the niobium and tantalum layers are larger than the layer thicknesses. The measured transition temperatures and perpendicular critical field slopes are compared to the predictions of proximity theory. The parallel critical fields and angular dependences are examined for the occurrence of a three-dimensional to two-dimensional crossover.
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Broussard et al. (1988) studied this question.
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