Superconducting and microstructural properties of two types of MgB/sub 2/ films prepared by pulsed laser deposition
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Date
2005-06
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Institute of Electrical and Electronics Engineers
Abstract
Significant differences in superconducting and microstructural properties between two types of MgB2 films prepared by pulsed laser deposition were determined. A very high Hc2 - T slope of 1.1 T/K was achieved in the in situ film. The Jc - H curves of the in situ film also show a much weaker field dependence than that of the ex situ film. The magneto-optical (MO) images show that at 4 K the flux penetrates the in situ MgB2 film through random paths, while for the ex situ film, the flux penetration pattern is mostly repeatable, indicating a defect-controlled flux penetration. Microstructural study (transmission electron microscopy and atomic force microscopy) revealed a relatively big grain size in the ex situ film. The correlation between the superconducting properties, microstructure and preparation conditions is discussed with regard to the two types of films. © 2005 IEEE.
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Keywords
Superconductivity, Films, Lasers, Transmission electron microscopy, Grain Size, Microstructure, Annealing, Temperature range, Scattering
Citation
Yue, Z., Ionescu, M., Roussel, M., Pan, A. V., Horvat, J., & Dou, S. X. (2005). Superconducting and microstructural properties of two types of MgB/sub 2/ films prepared by pulsed laser deposition. Paper presented to the Applied Superconductivity Conference: Harnessing the Magic (ASC 2004) 3-8 October 2004. Jacksonville, FL, United Stated. In IEEE Transactions on Applied Superconductivity, 15(2), 3261-3264. doi:10.1109/TASC.2005.848847