5 July 1996 Superconducting properties of Ta/Ge multilayers
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We report results of measurements on the superconductor/insulator system consisting of alternating layers of amorphous Ta and amorphous Ge. This system is relatively complex owing to a very thin mixed interface layer in which the pairing interaction is stronger than in the Ta itself. Measurements have now been performed using a dilution refrigerator at temperatures down to 50 mK, and using magnetic fields of up to 14 tesla. The phase diagram of the upper critical field versus temperature has been investigated for various layer thicknesses with the field both parallel and perpendicular to the layers. The results are shown to conform with existing theories on layered superconductors. The nonlinear I-V characteristic of these multilayers is also analyzed in zero field for a sample with thin superconducting layers and evidence for a Kosterlitz- Thouless transition is observed.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ben J. Ruck, S. Brown, H. Joseph Trodahl, "Superconducting properties of Ta/Ge multilayers", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250278; https://doi.org/10.1117/12.250278

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