High-quality Nb/HfO(x)-Hf/Nb Josephson junction

High-quality Nb/HfO(x)-Hf/Nb Josephson junction

A niobium (Nb) Josephson junction with a hafnium (Hf) overlayer was fabricated. The Hf native oxide, formed by thermal oxidation, was used as the new tunneling barrier. Hf was selected as an overlayer because of its good affinity to Nb and strong oxygen affinity. The junction was fabricated the same...

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Veröffentlicht in:Applied physics letters 1992-06, Vol.60 (24), p.3039-3041
Hauptverfasser: MOROHASHI, S H I N' I C H I, Imamura, Takeshi, HASUO, SHINYA
Format: Artikel
Sprache:eng
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Zusammenfassung:A niobium (Nb) Josephson junction with a hafnium (Hf) overlayer was fabricated. The Hf native oxide, formed by thermal oxidation, was used as the new tunneling barrier. Hf was selected as an overlayer because of its good affinity to Nb and strong oxygen affinity. The junction was fabricated the same way as Nv/AlO(x)-Al /Nb junctions. The junction showed excellent I-V characteristics. The critical current of the junction did not change with annealing up to 250 C. (Author)
ISSN:0003-6951