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

X. H. Zeng, A. Sukiasyan, X. X. Xi, Y. F. Hu, E. Wertz, Qi Li, W. Tian, H. P. Sun, X. Q. Pan, J. Lettieri, D. G. Schlom, C. O. Brubaker, Zi Kui Liu, Qiang Li

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)1840-1842
Number of pages3
JournalApplied Physics Letters
Volume79
Issue number12
DOIs
StatePublished - Sep 17 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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