Planar MgB 2 superconductor-normal metal-superconductor Josephson junctions fabricated using epitaxial MgB 2/TiB 2 bilayers

Ke Chen; Y. Cui; Qi Li; X. X. Xi; Shane A. Cybart; R. C. Dynes; X. Weng; E. C. Dickey; J. M. Redwing

doi:10.1063/1.2208555

Planar MgB ₂ superconductor-normal metal-superconductor Josephson junctions fabricated using epitaxial MgB ₂/TiB ₂ bilayers

Ke Chen, Y. Cui, Qi Li, X. X. Xi, Shane A. Cybart, R. C. Dynes, X. Weng, E. C. Dickey, J. M. Redwing

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

31 Scopus citations

Abstract

We have fabricated planar superconductor-normal metal-superconductor Mg B2 Josephson junctions using Ti B2 as the barrier material. On a bilayer film of Mg B2 Ti B2 on SiC substrate, Mg B2 was locally removed to create a gap of ≤50 nm, separating the Mg B2 film into two electrodes. A Josephson coupling is established through the Ti B2 film across the gap by proximity effect. The junctions exhibit resistively shunted junction like current-voltage characteristics up to 31 K. An ac Josephson effect was observed and the behavior of the Shapiro steps are in good agreement with theoretical predictions. The magnetic field modulation of the critical current also agrees with the thin film planar junction behavior.

Original language	English (US)
Article number	222511
Journal	Applied Physics Letters
Volume	88
Issue number	22
DOIs	https://doi.org/10.1063/1.2208555
State	Published - May 29 2006

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.2208555

Cite this

@article{01a62e5066044ba58787b2ca387d0b52,

title = "Planar MgB 2 superconductor-normal metal-superconductor Josephson junctions fabricated using epitaxial MgB 2/TiB 2 bilayers",

abstract = "We have fabricated planar superconductor-normal metal-superconductor Mg B2 Josephson junctions using Ti B2 as the barrier material. On a bilayer film of Mg B2 Ti B2 on SiC substrate, Mg B2 was locally removed to create a gap of ≤50 nm, separating the Mg B2 film into two electrodes. A Josephson coupling is established through the Ti B2 film across the gap by proximity effect. The junctions exhibit resistively shunted junction like current-voltage characteristics up to 31 K. An ac Josephson effect was observed and the behavior of the Shapiro steps are in good agreement with theoretical predictions. The magnetic field modulation of the critical current also agrees with the thin film planar junction behavior.",

author = "Ke Chen and Y. Cui and Qi Li and Xi, {X. X.} and Cybart, {Shane A.} and Dynes, {R. C.} and X. Weng and Dickey, {E. C.} and Redwing, {J. M.}",

note = "Funding Information: The work is partially funded by ONR under Grant Nos. N00014-00-1-0294 [for one of the authors (X.X.X.)] and N00014-01-1-0006 [for another author (J.M.R.)], by NSF under Grant Nos. DMR-0405502 [for another author (Q.L.)] and DMR-0306746 [for the two authors (X.X.X.) and (J.M.R.)], and by AFOSR Grant No. FA9550-04-1-0228 [for another author (R.C.D.)]. The authors thank John Rowell, Sam Benz, and Alan Kleinssaser for helpful discussions, and Arsen Soukiassian and Veni Adyam for help with the structural characterizations.",

year = "2006",

month = may,

day = "29",

doi = "10.1063/1.2208555",

language = "English (US)",

volume = "88",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "22",

}

TY - JOUR

T1 - Planar MgB 2 superconductor-normal metal-superconductor Josephson junctions fabricated using epitaxial MgB 2/TiB 2 bilayers

AU - Chen, Ke

AU - Cui, Y.

AU - Li, Qi

AU - Xi, X. X.

AU - Cybart, Shane A.

AU - Dynes, R. C.

AU - Weng, X.

AU - Dickey, E. C.

AU - Redwing, J. M.

N1 - Funding Information: The work is partially funded by ONR under Grant Nos. N00014-00-1-0294 [for one of the authors (X.X.X.)] and N00014-01-1-0006 [for another author (J.M.R.)], by NSF under Grant Nos. DMR-0405502 [for another author (Q.L.)] and DMR-0306746 [for the two authors (X.X.X.) and (J.M.R.)], and by AFOSR Grant No. FA9550-04-1-0228 [for another author (R.C.D.)]. The authors thank John Rowell, Sam Benz, and Alan Kleinssaser for helpful discussions, and Arsen Soukiassian and Veni Adyam for help with the structural characterizations.

PY - 2006/5/29

Y1 - 2006/5/29

N2 - We have fabricated planar superconductor-normal metal-superconductor Mg B2 Josephson junctions using Ti B2 as the barrier material. On a bilayer film of Mg B2 Ti B2 on SiC substrate, Mg B2 was locally removed to create a gap of ≤50 nm, separating the Mg B2 film into two electrodes. A Josephson coupling is established through the Ti B2 film across the gap by proximity effect. The junctions exhibit resistively shunted junction like current-voltage characteristics up to 31 K. An ac Josephson effect was observed and the behavior of the Shapiro steps are in good agreement with theoretical predictions. The magnetic field modulation of the critical current also agrees with the thin film planar junction behavior.

AB - We have fabricated planar superconductor-normal metal-superconductor Mg B2 Josephson junctions using Ti B2 as the barrier material. On a bilayer film of Mg B2 Ti B2 on SiC substrate, Mg B2 was locally removed to create a gap of ≤50 nm, separating the Mg B2 film into two electrodes. A Josephson coupling is established through the Ti B2 film across the gap by proximity effect. The junctions exhibit resistively shunted junction like current-voltage characteristics up to 31 K. An ac Josephson effect was observed and the behavior of the Shapiro steps are in good agreement with theoretical predictions. The magnetic field modulation of the critical current also agrees with the thin film planar junction behavior.

UR - http://www.scopus.com/inward/record.url?scp=33744795428&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33744795428&partnerID=8YFLogxK

U2 - 10.1063/1.2208555

DO - 10.1063/1.2208555

M3 - Article

AN - SCOPUS:33744795428

SN - 0003-6951

VL - 88

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 222511

ER -

Planar MgB ₂ superconductor-normal metal-superconductor Josephson junctions fabricated using epitaxial MgB ₂/TiB ₂ bilayers

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this