Conductance fluctuations in mesoscopic granular superconductors

Aviad Frydman, Edward P. Price, Robert C. Dynes

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4 Scopus citations


We report on a transport study of granular superconductivity films with lengths as small as 1000 Å and typical grain sizes of 100 Å. The I-V characteristics of these samples are hysteretic and exhibit sharp, discontinuous voltage jumps. We attribute these features to destruction of superconducting phase locking between individual grains. In addition, we observe a rich profile of conductance fluctuations which, unlike the previous features, are non-hysteretic. The amplitude of the fluctuations scales with the conductance and may reach values much larger than e2lh. We suggest that these features stem from interference of the superconductive wave-function, which is modulated by self induced flux penetrating the random granular network.

Original languageEnglish
Pages (from-to)715-719
Number of pages5
JournalSolid State Communications
Issue number11
StatePublished - 1998
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements-We gratefully acknowledgef ruitful discussions with S.I. Applebaum, R.P. Barber, A.V. Herzog, Y. Naveh, M. Pollak and P. Xiong. This research was supportedb y AFOSR grant no. f49620-92-j-0070.


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