Superconductivity and structure in sputtered Nb-Ta multilayers

P. R. Broussard; T. H. Geballe

doi:10.1103/PhysRevB.37.60

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Superconductivity and structure in sputtered Nb-Ta multilayers

P. R. Broussard, T. H. Geballe

DOI 10.1103/PhysRevB.37.60 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown