High- JcMgB2 Josephson junctions with operating temperature up to 40 K

Ke Chen; C. G. Zhuang; Qi Li; Y. Zhu; P. M. Voyles; X. Weng; J. M. Redwing; Rakesh Singh; A. W. Kleinsasser; X. X. Xi

doi:10.1063/1.3298366

High- J_cMgB₂ Josephson junctions with operating temperature up to 40 K

Ke Chen, C. G. Zhuang, Qi Li, Y. Zhu, P. M. Voyles, X. Weng, J. M. Redwing, Rakesh Singh, A. W. Kleinsasser, X. X. Xi

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

29 Scopus citations

Abstract

Sandwich-type MgB₂/MgO/MgB₂ Josephson junctions with Au or MgB₂ interconnection were fabricated using hybrid physical-chemical vapor deposited MgB₂ thin films and RF-magnetron-sputtered MgO barrier. The junctions show properties similar to those in high-J_cNb junctions with J_c up to 275kA/cm ² at 4 K, which remains nonzero up to 40 K. Critical current modulations by applied magnetic field and constant voltage steps under microwave radiation were observed. Combined with the larger energy gaps in MgB ₂ than in Nb, the junctions presented here allow simple MgB ₂ digital circuits to work over 20 K or with a clock speed above 1 THz.

Original language	English (US)
Article number	042506
Journal	Applied Physics Letters
Volume	96
Issue number	4
DOIs	https://doi.org/10.1063/1.3298366
State	Published - 2010

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3298366

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@article{9331329c4fbe4348b7d11103b6b1ebe5,

title = "High- JcMgB2 Josephson junctions with operating temperature up to 40 K",

abstract = "Sandwich-type MgB2/MgO/MgB2 Josephson junctions with Au or MgB2 interconnection were fabricated using hybrid physical-chemical vapor deposited MgB2 thin films and RF-magnetron-sputtered MgO barrier. The junctions show properties similar to those in high-JcNb junctions with Jc up to 275kA/cm 2 at 4 K, which remains nonzero up to 40 K. Critical current modulations by applied magnetic field and constant voltage steps under microwave radiation were observed. Combined with the larger energy gaps in MgB 2 than in Nb, the junctions presented here allow simple MgB 2 digital circuits to work over 20 K or with a clock speed above 1 THz.",

author = "Ke Chen and Zhuang, {C. G.} and Qi Li and Y. Zhu and Voyles, {P. M.} and X. Weng and Redwing, {J. M.} and Rakesh Singh and Kleinsasser, {A. W.} and Xi, {X. X.}",

note = "Funding Information: We would like to thank John Rowell, Nate Newman, Ruggero Vaglio, Bob Burhman, and Bob Dynes for helpful discussions. The work is partially funded by ONR under Grant No. N00014-07-1-0079 (X.X.X.) and by DOE under Grant No. DE-FG02-08ER46531 (Q.L.). We acknowledge use of facilities at the PSU Site of the NSF NNIN.",

year = "2010",

doi = "10.1063/1.3298366",

language = "English (US)",

volume = "96",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "4",

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TY - JOUR

T1 - High- JcMgB2 Josephson junctions with operating temperature up to 40 K

AU - Chen, Ke

AU - Zhuang, C. G.

AU - Li, Qi

AU - Zhu, Y.

AU - Voyles, P. M.

AU - Weng, X.

AU - Redwing, J. M.

AU - Singh, Rakesh

AU - Kleinsasser, A. W.

AU - Xi, X. X.

N1 - Funding Information: We would like to thank John Rowell, Nate Newman, Ruggero Vaglio, Bob Burhman, and Bob Dynes for helpful discussions. The work is partially funded by ONR under Grant No. N00014-07-1-0079 (X.X.X.) and by DOE under Grant No. DE-FG02-08ER46531 (Q.L.). We acknowledge use of facilities at the PSU Site of the NSF NNIN.

PY - 2010

Y1 - 2010

N2 - Sandwich-type MgB2/MgO/MgB2 Josephson junctions with Au or MgB2 interconnection were fabricated using hybrid physical-chemical vapor deposited MgB2 thin films and RF-magnetron-sputtered MgO barrier. The junctions show properties similar to those in high-JcNb junctions with Jc up to 275kA/cm 2 at 4 K, which remains nonzero up to 40 K. Critical current modulations by applied magnetic field and constant voltage steps under microwave radiation were observed. Combined with the larger energy gaps in MgB 2 than in Nb, the junctions presented here allow simple MgB 2 digital circuits to work over 20 K or with a clock speed above 1 THz.

AB - Sandwich-type MgB2/MgO/MgB2 Josephson junctions with Au or MgB2 interconnection were fabricated using hybrid physical-chemical vapor deposited MgB2 thin films and RF-magnetron-sputtered MgO barrier. The junctions show properties similar to those in high-JcNb junctions with Jc up to 275kA/cm 2 at 4 K, which remains nonzero up to 40 K. Critical current modulations by applied magnetic field and constant voltage steps under microwave radiation were observed. Combined with the larger energy gaps in MgB 2 than in Nb, the junctions presented here allow simple MgB 2 digital circuits to work over 20 K or with a clock speed above 1 THz.

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DO - 10.1063/1.3298366

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VL - 96

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - 042506

ER -

High- J_cMgB₂ Josephson junctions with operating temperature up to 40 K

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