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 |
| 巻 | 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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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
}
TY - JOUR
T1 - Thermal activation and injection of charge solitons in 2D-arrays of small Josephson junctions.
AU - Delsing, P.
AU - Chen, C. D.
AU - Haviland, D. B.
AU - Harada, Yuichi
AU - Claeson, T.
PY - 1994/2/2
Y1 - 1994/2/2
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.
UR - http://www.scopus.com/inward/record.url?scp=0028759665&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028759665&partnerID=8YFLogxK
U2 - 10.1016/0921-4526(94)90826-5
DO - 10.1016/0921-4526(94)90826-5
M3 - Article
VL - 194-196
SP - 993
EP - 994
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - PART 1
ER -