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.
N1 - Funding Information:
Manuscript received August 27, 2006. The work of X. X. Xi was supported by ONR under Grant N00014-00-1-0294 and by NSF under Grant DMR-0306746. The work of Q. Li was supported by NSF under Grant DMR-0405502. K. Chen, Y. Cui, and Q. Li are with the Department of Physics, The Pennsylvania University, University Park, PA 16802 USA (e-mail: [email protected]). X. X. Xi is with the Department of Physics and the Department of Materials Science and Engineering, The Pennsylvania University, University Park, PA 16802 USA. Digital Object Identifier 10.1109/TASC.2007.898108
PY - 2007/6
Y1 - 2007/6
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.
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U2 - 10.1109/TASC.2007.898108
DO - 10.1109/TASC.2007.898108
M3 - Article
AN - SCOPUS:34547399068
SN - 1051-8223
VL - 17
SP - 955
EP - 958
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
ER -