Superconducting properties of nanocrystalline MgB2 thin films made by an in situ annealing process

We have studied the structural and superconducting properties of MgB2 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 MgB2 with very small grain sizes. A zero-resistan...

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Bibliographic Details
Published in:Applied physics letters 2001-09, Vol.79 (12), p.1840-1842
Main Authors: 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., Schlom, D. G., Brubaker, C. O., Liu, Zi-Kui, Li, Qiang
Format: Article
Language:English
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Summary:We have studied the structural and superconducting properties of MgB2 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 MgB2 with very small grain sizes. A zero-resistance transition temperature (Tc0) of 34 K and a zero-field critical current density (Jc) of 1.3×106 A/cm2 were obtained. The irreversibility field was ∼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 MgB2 Josephson junction technologies.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1405431