Conductance fluctuations in mesoscopic granular superconductors

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

doi:10.1016/s0038-1098(98)00127-6

Conductance fluctuations in mesoscopic granular superconductors

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

University of California at San Diego

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 language	English
Pages (from-to)	715-719
Number of pages	5
Journal	Solid State Communications
Volume	106
Issue number	11
DOIs	https://doi.org/10.1016/s0038-1098(98)00127-6
State	Published - 1998
Externally published	Yes

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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title = "Conductance fluctuations in mesoscopic granular superconductors",

abstract = "We report on a transport study of granular superconductivity films with lengths as small as 1000 {\AA} and typical grain sizes of 100 {\AA}. 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.",

author = "Aviad Frydman and Price, {Edward P.} and Dynes, {Robert C.}",

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.",

year = "1998",

doi = "10.1016/s0038-1098(98)00127-6",

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AU - Frydman, Aviad

AU - Price, Edward P.

AU - Dynes, Robert C.

N1 - 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.

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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Conductance fluctuations in mesoscopic granular superconductors

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