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Search for New Materials and Techniques for Superfluid Weak Links

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Abstract

Superfluid 3He-flow in channels essentially smaller than the coherence length would be challenging. In this paper, a technique is described which allows the production of almost circularly shaped 10 nm diameter holes in nitrocellulose films of 14 nm thickness. These geometrical dimensions also allow Josephson effect experiments in superfluid 4He of about 1% superfluid density around temperatures of 0.9999 Tλ. The hole density in the membranes can be as high as 10 8 cm−2 which allows one to work with high Josephson currents while at the same time the decoherence effect of vibrations is minimised. Alternative solutions for even smaller holes in several differently designed membranes are discussed.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany

    S. V. Pereverzev & G. Eska

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  1. S. V. Pereverzev
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  2. G. Eska
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Pereverzev, S.V., Eska, G. Search for New Materials and Techniques for Superfluid Weak Links. Journal of Low Temperature Physics 124, 383–393 (2001). https://doi.org/10.1023/A:1017506825058

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