Millimeter-wave response and linewidth of Josephson oscillations in YBa2Cu3O7 step-edge junctions

Yu. Ya. Divin; A. V. Andreev; Gerd Michael Fischer; Jesper Mygind; Niels Falsig Pedersen; K. Herrmann; V. N. Glyantsev; M. Siegel; A. I. Braginski

doi:10.1063/1.108712

Millimeter-wave response and linewidth of Josephson oscillations in YBa2Cu3O7 step-edge junctions

Yu. Ya. Divin, A. V. Andreev, Gerd Michael Fischer, Jesper Mygind, Niels Falsig Pedersen, K. Herrmann, V. N. Glyantsev, M. Siegel, A. I. Braginski

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Abstract

We have studied the response of YBa2Cu3O7 step-edge junctions to low-intensity millimeter-wave radiation in the temperature range from 4 to 80 K. The linewidth of the Josephson oscillations derived from the resonant part of the response at voltages V congruent-to (h/2e)f is shown to be determined by thermal fluctuations at liquid nitrogen temperatures. At lower temperatures the observed linewidth increases indicating that low-frequency fluctuations become dominant in the junction as the temperature is reduced. Due to an inhomogeneous spatial distribution of the current the step-edge junction might be considered as a multijunction multiloop interferometer and the excess noise can be discussed in terms of spontaneous transitions between the different states of these interferometers.

Original language	English
Journal	Applied Physics Letters
Volume	62
Issue number	11
Pages (from-to)	1295-1297
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.108712
Publication status	Published - 1993

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Copyright (1993) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics

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title = "Millimeter-wave response and linewidth of Josephson oscillations in YBa2Cu3O7 step-edge junctions",

abstract = "We have studied the response of YBa2Cu3O7 step-edge junctions to low-intensity millimeter-wave radiation in the temperature range from 4 to 80 K. The linewidth of the Josephson oscillations derived from the resonant part of the response at voltages V congruent-to (h/2e)f is shown to be determined by thermal fluctuations at liquid nitrogen temperatures. At lower temperatures the observed linewidth increases indicating that low-frequency fluctuations become dominant in the junction as the temperature is reduced. Due to an inhomogeneous spatial distribution of the current the step-edge junction might be considered as a multijunction multiloop interferometer and the excess noise can be discussed in terms of spontaneous transitions between the different states of these interferometers.",

author = "Divin, {Yu. Ya.} and Andreev, {A. V.} and Fischer, {Gerd Michael} and Jesper Mygind and Pedersen, {Niels Falsig} and K. Herrmann and Glyantsev, {V. N.} and M. Siegel and Braginski, {A. I.}",

note = "Copyright (1993) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics",

year = "1993",

doi = "10.1063/1.108712",

language = "English",

volume = "62",

pages = "1295--1297",

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T1 - Millimeter-wave response and linewidth of Josephson oscillations in YBa2Cu3O7 step-edge junctions

AU - Divin, Yu. Ya.

AU - Andreev, A. V.

AU - Fischer, Gerd Michael

AU - Mygind, Jesper

AU - Pedersen, Niels Falsig

AU - Herrmann, K.

AU - Glyantsev, V. N.

AU - Siegel, M.

AU - Braginski, A. I.

N1 - Copyright (1993) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics

PY - 1993

Y1 - 1993

N2 - We have studied the response of YBa2Cu3O7 step-edge junctions to low-intensity millimeter-wave radiation in the temperature range from 4 to 80 K. The linewidth of the Josephson oscillations derived from the resonant part of the response at voltages V congruent-to (h/2e)f is shown to be determined by thermal fluctuations at liquid nitrogen temperatures. At lower temperatures the observed linewidth increases indicating that low-frequency fluctuations become dominant in the junction as the temperature is reduced. Due to an inhomogeneous spatial distribution of the current the step-edge junction might be considered as a multijunction multiloop interferometer and the excess noise can be discussed in terms of spontaneous transitions between the different states of these interferometers.

AB - We have studied the response of YBa2Cu3O7 step-edge junctions to low-intensity millimeter-wave radiation in the temperature range from 4 to 80 K. The linewidth of the Josephson oscillations derived from the resonant part of the response at voltages V congruent-to (h/2e)f is shown to be determined by thermal fluctuations at liquid nitrogen temperatures. At lower temperatures the observed linewidth increases indicating that low-frequency fluctuations become dominant in the junction as the temperature is reduced. Due to an inhomogeneous spatial distribution of the current the step-edge junction might be considered as a multijunction multiloop interferometer and the excess noise can be discussed in terms of spontaneous transitions between the different states of these interferometers.

U2 - 10.1063/1.108712

DO - 10.1063/1.108712

M3 - Journal article

SN - 0003-6951

VL - 62

SP - 1295

EP - 1297

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

ER -

Millimeter-wave response and linewidth of Josephson oscillations in YBa2Cu3O7 step-edge junctions

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