Superconducting properties of nanocrystalline MgB{sub 2} thin films made by an in situ annealing process

Journal Article · Mon Sep 17 04:00:00 EDT 2001 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1405431· OSTI ID:40277733

Zeng, X H; Sukiasyan, A; Xi, X X; Hu, Y F; Wertz, E; Li, Qi; Tian, W; Sun, H P; Pan, X Q; Lettieri, J ^[1]

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1. and others

We have studied the structural and superconducting properties of MgB{sub 2} thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB{sub 2} with very small grain sizes. A zero-resistance transition temperature (T{sub c0}) of 34 K and a zero-field critical current density (J{sub c}) of 1.3 x 10{sup 6} A/cm{sup 2} were obtained. The irreversibility field was {approx}8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB{sub 2} Josephson junction technologies.

• Research Organization: Brookhaven National Laboratory
• Sponsoring Organization: (US)
• DOE Contract Number: AC02-98CH10886; FG02-97ER45638
• OSTI ID: 40277733
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 12 Vol. 79; ISSN 0003-6951
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
CRITICAL CURRENT
DEPOSITION
GRAIN SIZE
INSTABILITY
JOSEPHSON JUNCTIONS
MIXTURES
THIN FILMS
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY