Coherent response of two nearly identical stacked Josephson junctions to mm wave irradiation

I. P. Nevirkovets

doi:10.1016/S0964-1807(98)00002-7

Coherent response of two nearly identical stacked Josephson junctions to mm wave irradiation

I. P. Nevirkovets^*

^*Corresponding author for this work

Physics and Astronomy

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

4 Scopus citations

Abstract

Double-barrier Nb/Al-AlO_x-Nb/Al-AlO_x-Nb tunnel devices with nearly identical Josephson critical current densities of the single junctions have been investigated under influence of the electromagnetic irradiation in the frequency range from 78 to 119 GHz. Odd, even, and fractional Shapiro steps have been observed in the weak-signal regime. The switching of the device to the double gap-sum voltage occurs from even steps, whereas the switching to the single gap-sum voltage has usually been observed from odd steps. The even steps have a much larger amplitude than the odd steps. This behavior is explained as a manifestation of the coherent phase-locking of the two junctions to the applied mm wave signal. Fractional steps may be evidence of a nonlinear interaction between the junctions.

Original language	English (US)
Pages (from-to)	291-295
Number of pages	5
Journal	Applied Superconductivity
Volume	5
Issue number	7-12
DOIs	https://doi.org/10.1016/S0964-1807(98)00002-7
State	Published - 1997

Funding

This work was supported by the Royal Society and INTAS grant No. 94-1783. The samples were fabricated at the Department of Materials Science and Metallurgy, University of Cambridge, U.K.; the measurements were carried out at the Institute for Thin Film and Ion Technology, KFA Juelich, Germany. The author is grateful to J.E. Evetts, M.G. Blamire, A.V. Ustinov, and V.M. Krasnov for fruitful discussions and assistance.

ASJC Scopus subject areas

General Engineering
General Physics and Astronomy

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10.1016/S0964-1807(98)00002-7

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title = "Coherent response of two nearly identical stacked Josephson junctions to mm wave irradiation",

abstract = "Double-barrier Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with nearly identical Josephson critical current densities of the single junctions have been investigated under influence of the electromagnetic irradiation in the frequency range from 78 to 119 GHz. Odd, even, and fractional Shapiro steps have been observed in the weak-signal regime. The switching of the device to the double gap-sum voltage occurs from even steps, whereas the switching to the single gap-sum voltage has usually been observed from odd steps. The even steps have a much larger amplitude than the odd steps. This behavior is explained as a manifestation of the coherent phase-locking of the two junctions to the applied mm wave signal. Fractional steps may be evidence of a nonlinear interaction between the junctions.",

author = "Nevirkovets, {I. P.}",

note = "Funding Information: This work was supported by the Royal Society and INTAS grant No. 94-1783. The samples were fabricated at the Department of Materials Science and Metallurgy, University of Cambridge, U.K.; the measurements were carried out at the Institute for Thin Film and Ion Technology, KFA Juelich, Germany. The author is grateful to J.E. Evetts, M.G. Blamire, A.V. Ustinov, and V.M. Krasnov for fruitful discussions and assistance. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

year = "1997",

doi = "10.1016/S0964-1807(98)00002-7",

language = "English (US)",

volume = "5",

pages = "291--295",

journal = "Applied Superconductivity",

issn = "0964-1807",

publisher = "Pergamon Press Ltd.",

number = "7-12",

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AU - Nevirkovets, I. P.

N1 - Funding Information: This work was supported by the Royal Society and INTAS grant No. 94-1783. The samples were fabricated at the Department of Materials Science and Metallurgy, University of Cambridge, U.K.; the measurements were carried out at the Institute for Thin Film and Ion Technology, KFA Juelich, Germany. The author is grateful to J.E. Evetts, M.G. Blamire, A.V. Ustinov, and V.M. Krasnov for fruitful discussions and assistance. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 1997

Y1 - 1997

N2 - Double-barrier Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with nearly identical Josephson critical current densities of the single junctions have been investigated under influence of the electromagnetic irradiation in the frequency range from 78 to 119 GHz. Odd, even, and fractional Shapiro steps have been observed in the weak-signal regime. The switching of the device to the double gap-sum voltage occurs from even steps, whereas the switching to the single gap-sum voltage has usually been observed from odd steps. The even steps have a much larger amplitude than the odd steps. This behavior is explained as a manifestation of the coherent phase-locking of the two junctions to the applied mm wave signal. Fractional steps may be evidence of a nonlinear interaction between the junctions.

AB - Double-barrier Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with nearly identical Josephson critical current densities of the single junctions have been investigated under influence of the electromagnetic irradiation in the frequency range from 78 to 119 GHz. Odd, even, and fractional Shapiro steps have been observed in the weak-signal regime. The switching of the device to the double gap-sum voltage occurs from even steps, whereas the switching to the single gap-sum voltage has usually been observed from odd steps. The even steps have a much larger amplitude than the odd steps. This behavior is explained as a manifestation of the coherent phase-locking of the two junctions to the applied mm wave signal. Fractional steps may be evidence of a nonlinear interaction between the junctions.

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DO - 10.1016/S0964-1807(98)00002-7

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SN - 0964-1807

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EP - 295

JO - Applied Superconductivity

JF - Applied Superconductivity

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ER -

Coherent response of two nearly identical stacked Josephson junctions to mm wave irradiation

Abstract

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ASJC Scopus subject areas

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