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Growth of superconducting MgB2 thin films via postannealing techniques
Growth of superconducting MgB2 thin films via postannealing techniques
- Source :
-
Physica C . Mar2003, Vol. 385 Issue 1/2, p24. 7p. - Publication Year :
- 2003
-
Abstract
- We report the effect of annealing on the superconductivity of MgB2 thin films as a function of the postannealing temperature in the range from 700 to 950 °C and of the postannealing time in the range from 30 to 120 min. On annealing at 900 °C for 30 min, we obtained the best-quality MgB2 films with a transition temperature of 39 K and a critical current density of ∼107 A/cm2. Using scanning electron microscopy, we also investigated the film growth mechanism. The samples annealed at higher temperatures showed larger grain sizes, well-aligned crystal structures with preferential orientation along the <f>c</f>-axis, and smooth surface morphologies. However, a longer annealing time prevented the alignment of grains and reduced superconductivity, indicating a strong interfacial reaction between the substrate and the MgB2 film. [Copyright &y& Elsevier]
- Subjects :
- *THIN films
*ANNEALING of crystals
Subjects
Details
- Language :
- English
- ISSN :
- 09214534
- Volume :
- 385
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Physica C
- Publication Type :
- Academic Journal
- Accession number :
- 8902666
- Full Text :
- https://doi.org/10.1016/S0921-4534(02)02310-9