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Growth of superconducting MgB2 thin films via postannealing techniques

Growth of superconducting MgB2 thin films via postannealing techniques

Authors :
Kang, W.N.
Choi, Eun-Mi
Kim, Hyeong-Jin
Kim, Hyun-Jung
Lee, Sung-Ik
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

Subjects :
*THIN films
*ANNEALING of crystals

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