Study of planar MgB2/TiB2/MgB2 Josephson junctions using the proximity effect SNS model

Ke Chen, Y. Cui, Qi Li, X. X. Xi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Planar MgB2/TiB2/MgB2 junctions were fabricated by locally removing MgB2 within a gap of ≤ 50 nm on a bilayer film of MgB2/TiB2 on SiC substrate using focused ion beam (FIB). Junctions with gaps of different depths were studied. We found that when the gap is too shallow the junction shows a flux-flow behavior, while a too deep gap will result In a junction with no supercurrent. Only junctions with the right gap depth exhibit good resistively-shunted-junction (RSJ) like current-voltage characteristics and excellent ac Josephson effect. The junctions' behavior can be described by the proximity effect superconductor-normal metal-superconductor (SNS) model, suggesting that the Josephson coupling is through the proximity effect in the metallic TiB 2 layer.

Original languageEnglish (US)
Pages (from-to)955-958
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
StatePublished - Jun 1 2007

Fingerprint

Josephson junctions
Superconducting materials
Metals
Focused ion beams
Current voltage characteristics
metals
Fluxes
Substrates
Josephson effect
ion beams
electric potential

All Science Journal Classification (ASJC) codes

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

Cite this

@article{5c01870a40f5475b94e0298c59b58496,
title = "Study of planar MgB2/TiB2/MgB2 Josephson junctions using the proximity effect SNS model",
abstract = "Planar MgB2/TiB2/MgB2 junctions were fabricated by locally removing MgB2 within a gap of ≤ 50 nm on a bilayer film of MgB2/TiB2 on SiC substrate using focused ion beam (FIB). Junctions with gaps of different depths were studied. We found that when the gap is too shallow the junction shows a flux-flow behavior, while a too deep gap will result In a junction with no supercurrent. Only junctions with the right gap depth exhibit good resistively-shunted-junction (RSJ) like current-voltage characteristics and excellent ac Josephson effect. The junctions' behavior can be described by the proximity effect superconductor-normal metal-superconductor (SNS) model, suggesting that the Josephson coupling is through the proximity effect in the metallic TiB 2 layer.",
author = "Ke Chen and Y. Cui and Qi Li and Xi, {X. X.}",
year = "2007",
month = "6",
day = "1",
doi = "10.1109/TASC.2007.898108",
language = "English (US)",
volume = "17",
pages = "955--958",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "2",

}

Study of planar MgB2/TiB2/MgB2 Josephson junctions using the proximity effect SNS model. / Chen, Ke; Cui, Y.; Li, Qi; Xi, X. X.

In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 01.06.2007, p. 955-958.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of planar MgB2/TiB2/MgB2 Josephson junctions using the proximity effect SNS model

AU - Chen, Ke

AU - Cui, Y.

AU - Li, Qi

AU - Xi, X. X.

PY - 2007/6/1

Y1 - 2007/6/1

N2 - Planar MgB2/TiB2/MgB2 junctions were fabricated by locally removing MgB2 within a gap of ≤ 50 nm on a bilayer film of MgB2/TiB2 on SiC substrate using focused ion beam (FIB). Junctions with gaps of different depths were studied. We found that when the gap is too shallow the junction shows a flux-flow behavior, while a too deep gap will result In a junction with no supercurrent. Only junctions with the right gap depth exhibit good resistively-shunted-junction (RSJ) like current-voltage characteristics and excellent ac Josephson effect. The junctions' behavior can be described by the proximity effect superconductor-normal metal-superconductor (SNS) model, suggesting that the Josephson coupling is through the proximity effect in the metallic TiB 2 layer.

AB - Planar MgB2/TiB2/MgB2 junctions were fabricated by locally removing MgB2 within a gap of ≤ 50 nm on a bilayer film of MgB2/TiB2 on SiC substrate using focused ion beam (FIB). Junctions with gaps of different depths were studied. We found that when the gap is too shallow the junction shows a flux-flow behavior, while a too deep gap will result In a junction with no supercurrent. Only junctions with the right gap depth exhibit good resistively-shunted-junction (RSJ) like current-voltage characteristics and excellent ac Josephson effect. The junctions' behavior can be described by the proximity effect superconductor-normal metal-superconductor (SNS) model, suggesting that the Josephson coupling is through the proximity effect in the metallic TiB 2 layer.

UR - http://www.scopus.com/inward/record.url?scp=34547399068&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547399068&partnerID=8YFLogxK

U2 - 10.1109/TASC.2007.898108

DO - 10.1109/TASC.2007.898108

M3 - Article

VL - 17

SP - 955

EP - 958

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 2

ER -