Template engineering of Co-doped BaFe2As2 single-crystal thin films

Title
Template engineering of Co-doped BaFe2As2 single-crystal thin films
Authors
S. LeeJ. JiangY. ZhangC.W. BarkJ. D.WeissC. TarantiniC. T. Nelson장호원C. M. FolkmanS. H. BaekA. PolyanskiiD. AbraimovA. YamamotoJ.W. ParkX. Q. PanE. E. HellstromD. C. LarbalestierC. B. Eom
Keywords
Ferropnictide superconductors; Template engineering; Epitaxial thin films; 2E21722
Issue Date
2010-05
Publisher
Nature materials
Citation
VOL 9, NO 5, 397-402
Abstract
Understanding new superconductors requires high-quality epitaxial thin films to explore intrinsic electromagnetic properties and evaluate device applications1-9. So far, superconducting properties of ferropnictide thin films seem compromised by imperfect epitaxial growth and poor connectivity of the superconducting phase10-14. 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.
URI
http://pubs.kist.re.kr/handle/201004/37181
ISSN
1476-1122
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