Thermal activation and injection of charge solitons in 2D-arrays of small Josephson junctions.

P. Delsing, C. D. Chen, D. B. Haviland, Yuichi Harada, T. Claeson

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

抄録

We have measured the zero bias resistance, R0, and the threshold voltage, Vt, of 2D arrays of small Josephson junctions as functions of temperature and magnetic field. At low temperature, the Coulomb blockade dominates due to the relatively large charging energy EC= e2 2C (C being the junction capacitance). We find that the zero bias resistance may be described by thermal activation of charge solitons in most cases, i.e., R0≈k exp( Ea kBT). In the normal state, the activation energy Ea is close to 0.25 EC. The measured activation energy at low magnetic field is less than 0.25EC+Δ (where Δ is the superconducting gap), but larger than EC for all arrays. In a few samples, where the Josephson coupling energy EJ is relatively large, Ea oscillates with the magnetic field. The period of the oscillation corresponds to one flux quantum per unit cell and the amplitude is roughly EJ. In these samples the threshold voltage also oscillates at low magnetic fields. Such behavior of both Ea and Vt is a clear indication that also Cooper pair solitons contribute to the charge transport.

元の言語英語
ページ(範囲)993-994
ページ数2
ジャーナルPhysica B: Physics of Condensed Matter
194-196
発行部数PART 1
DOI
出版物ステータス出版済み - 2 2 1994
外部発表Yes

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Solitons
Josephson junctions
solitary waves
Chemical activation
activation
injection
Magnetic fields
Threshold voltage
magnetic fields
threshold voltage
Activation energy
activation energy
Coulomb blockade
charging
Charge transfer
indication
Temperature distribution
temperature distribution
Capacitance
capacitance

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

これを引用

Thermal activation and injection of charge solitons in 2D-arrays of small Josephson junctions. / Delsing, P.; Chen, C. D.; Haviland, D. B.; Harada, Yuichi; Claeson, T.

:: Physica B: Physics of Condensed Matter, 巻 194-196, 番号 PART 1, 02.02.1994, p. 993-994.

研究成果: ジャーナルへの寄稿記事

Delsing, P. ; Chen, C. D. ; Haviland, D. B. ; Harada, Yuichi ; Claeson, T. / Thermal activation and injection of charge solitons in 2D-arrays of small Josephson junctions. :: Physica B: Physics of Condensed Matter. 1994 ; 巻 194-196, 番号 PART 1. pp. 993-994.
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AU - Claeson, T.

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N2 - We have measured the zero bias resistance, R0, and the threshold voltage, Vt, of 2D arrays of small Josephson junctions as functions of temperature and magnetic field. At low temperature, the Coulomb blockade dominates due to the relatively large charging energy EC= e2 2C (C being the junction capacitance). We find that the zero bias resistance may be described by thermal activation of charge solitons in most cases, i.e., R0≈k exp( Ea kBT). In the normal state, the activation energy Ea is close to 0.25 EC. The measured activation energy at low magnetic field is less than 0.25EC+Δ (where Δ is the superconducting gap), but larger than EC for all arrays. In a few samples, where the Josephson coupling energy EJ is relatively large, Ea oscillates with the magnetic field. The period of the oscillation corresponds to one flux quantum per unit cell and the amplitude is roughly EJ. In these samples the threshold voltage also oscillates at low magnetic fields. Such behavior of both Ea and Vt is a clear indication that also Cooper pair solitons contribute to the charge transport.

AB - We have measured the zero bias resistance, R0, and the threshold voltage, Vt, of 2D arrays of small Josephson junctions as functions of temperature and magnetic field. At low temperature, the Coulomb blockade dominates due to the relatively large charging energy EC= e2 2C (C being the junction capacitance). We find that the zero bias resistance may be described by thermal activation of charge solitons in most cases, i.e., R0≈k exp( Ea kBT). In the normal state, the activation energy Ea is close to 0.25 EC. The measured activation energy at low magnetic field is less than 0.25EC+Δ (where Δ is the superconducting gap), but larger than EC for all arrays. In a few samples, where the Josephson coupling energy EJ is relatively large, Ea oscillates with the magnetic field. The period of the oscillation corresponds to one flux quantum per unit cell and the amplitude is roughly EJ. In these samples the threshold voltage also oscillates at low magnetic fields. Such behavior of both Ea and Vt is a clear indication that also Cooper pair solitons contribute to the charge transport.

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