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
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. These bulk-like superconducting properties show that the in situ deposition process can be a viable candidate for MgB2 Josephson junction technologies.
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