MgB{sub 2} tunnel junctions and 19 K low-noise dc superconducting quantum interference devices.

Journal Article · Mon Jan 01 00:00:00 EST 2001 · Appl. Phys. Lett.

DOI:https://doi.org/10.1063/1.1424465· OSTI ID:949638

Zhang, Y; Kinion, D; Chen, J; Clarke, J; Hinks, D G; Crabtree, G W

Point contact junctions made from two pieces of MgB{sub 2} can be adjusted to exhibit either superconductor-insulator-superconductor (SIS) or superconductor-normal metal-superconductor (SNS) current-voltage characteristics. The SIS characteristics are in good agreement with the standard tunneling model for s-wave superconductors, and yield an energy gap of (2.02{+-}0.08) meV. The SNS characteristics are in good agreement with the predictions of the resistively-shunted junction model. DC superconducting quantum interference devices made from two SNS junctions yield magnetic flux and field noise as low as 4 {mu}{Phi}{sub 0} Hz{sup -1/2} and 35 fT Hz{sup -1/2} at 19 K; {Phi}{sub 0} is the flux quantum.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 949638
• Report Number(s): ANL/MSD/JA-42765; APPLAB; TRN: US201012%%421
• Journal Information: Appl. Phys. Lett., Vol. 79, Issue 24 ; 2001; ISSN 0003-6951
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

42 ENGINEERING
ENERGY GAP
MAGNETIC FLUX
SQUID DEVICES
SUPERCONDUCTORS
TUNNELING