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

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
September 2001
Applied Physics Letters;9/17/2001, Vol. 79 Issue 12, p1840
Academic Journal
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 1.3×10[sup 6] A/cm[sup 2] 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 MgB[sub 2] Josephson junction technologies. © 2001 American Institute of Physics.


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