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1 Mar 1983

Volume 42, Issue 5, pp. 401-476

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Submicron multifilamentary high performance Nb3Sn produced by powder metallurgy processing of large powders

J. Otubo, S. Pourrahimi, H. Zhang, C. L. H. Thieme, and S. Foner

Appl. Phys. Lett. 42, 469 (1983); http://dx.doi.org/10.1063/1.93973 (3 pages) | Cited 3 times

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Powder metallurgy processed submicron multifilamentary Nb3Sn superconducting wires were fabricated starting with 250–500‐μm‐diam powders. A multiple strand bundling procedure was used to simulate large scale production with actual areal reductions greater than 106 to achieve submicron fibers. Both external tin and tin core processing were successful. Typical Cu‐36 wt.% Nb‐Sn materials gave overall critical current densities of 8×104 A/cm2 at 12 T, 3×104 A/cm2 at 14 T, and 6×103 A/cm2 at 16 T. These results demonstrate that particle size and billet size can be scaled from earlier laboratory scale to large scale fabrication to produce high performance materials.
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74.25.Sv Critical currents
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.70.-b Superconducting materials other than cuprates
74.25.-q Properties of superconductors

High quality refractory Josephson tunnel junctions utilizing thin aluminum layers

M. Gurvitch, M. A. Washington, and H. A. Huggins

Appl. Phys. Lett. 42, 472 (1983); http://dx.doi.org/10.1063/1.93974 (3 pages) | Cited 199 times

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Preparation of high quality all‐refractory Josephson tunnel junctions based on Nb/Al‐oxide‐Nb and Nb/Al‐oxide‐Al/Nb structures is reported. Critical currents up to 1300 A/cm2 and Vm values up to 35 mV were obtained. The specific capacitance of these junctions is 0.06±0.02 pF/μm2. Junctions were fabricated using standard photolithography and a new plasma etching process coupled with anodization of Nb.
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85.25.-j Superconducting devices

Coherent behavior of 2N‐Josephson junction closed loop

Tadayuki Kobayashi, Katsuyoshi Hamasaki, Nobuyoshi Kondoh, Toranosuke Komata, and Tsutomu Yamashita

Appl. Phys. Lett. 42, 475 (1983); http://dx.doi.org/10.1063/1.93975 (2 pages) | Cited 9 times

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Voltage‐current characteristics of a superconducting closed loop which consists of a parallel combination of two linear series arrays of N‐Josephson junctions are theoretically and experimentally investigated for N=3. The results show that the rf‐induced constant voltage steps in v‐i characteristics in the presence of the rf radiation of frequency F appear at voltages corresponding to nNFΦ0 with an integer n. We find that the junctions show a coherent behavior even though the closed loop does not consist of identical junctions. The voltage standard application of this circuit seems feasible.
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85.25.-j Superconducting devices
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