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- Title
Template engineering of Co-doped BaFe<sub>2</sub>As<sub>2</sub> single-crystal thin films.
- Authors
Lee, S.; Jiang, J.; Zhang, Y.; Bark, C. W.; Weiss, J. D.; Tarantini, C.; Nelson, C. T.; Jang, H. W.; Folkman, C. M.; Baek, S. H.; Polyanskii, A.; Abraimov, D.; Yamamoto, A.; Park, J. W.; Pan, X. Q.; Hellstrom, E. E.; Larbalestier, D. C.; Eom, C. B.
- Abstract
Understanding new superconductors requires high-quality epitaxial thin films to explore intrinsic electromagnetic properties and evaluate device applications. So far, superconducting properties of ferropnictide thin films seem compromised by imperfect epitaxial growth and poor connectivity of the superconducting phase. Here we report new template engineering using single-crystal intermediate layers of (001) SrTiO3 and BaTiO3 grown on various perovskite substrates that enables genuine epitaxial films of Co-doped BaFe2As2 with a high transition temperature (Tc,ρ=0 of 21.5 K, where ρ=resistivity), a small transition width (ΔTc=1.3 K), a superior critical current density Jc of 4.5 MA cm−2 (4.2 K) and strong c-axis flux pinning. Implementing SrTiO3 or BaTiO3 templates to match the alkaline-earth layer in the Ba-122 with the alkaline-earth/oxygen layer in the templates opens new avenues for epitaxial growth of ferropnictides on multifunctional single-crystal substrates. Beyond superconductors, it provides a framework for growing heteroepitaxial intermetallic compounds on various substrates by matching interfacial layers between templates and thin-film overlayers.
- Subjects
SUPERCONDUCTORS; THIN films; DENSITY; INTERMETALLIC compounds; EPITAXY
- Publication
Nature Materials, 2010, Vol 9, Issue 5, p397
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat2721