Template engineering of Co-doped BaFe2 As 2 single-crystal thin films

S. Lee; J. Jiang; Y. Zhang; C. W. Bark; J. D. Weiss; C. Tarantini; C. T. Nelson; H. W. Jang; C. M. Folkman; S. H. Baek; A. Polyanskii; D. Abraimov; A. Yamamoto; J. W. Park; X. Q. Pan; E. E. Hellstrom; D. C. Larbalestier; C. B. Eom

doi:10.1038/nmat2721

Template engineering of Co-doped BaFe₂ As ₂ single-crystal thin films

S. Lee, J. Jiang, Y. Zhang, C. W. Bark, J. D. Weiss, C. Tarantini, C. T. Nelson, H. W. Jang, C. M. Folkman, S. H. Baek, A. Polyanskii, D. Abraimov, A. Yamamoto, J. W. Park, X. Q. Pan, E. E. Hellstrom, D. C. Larbalestier, C. B. Eom

Research output: Contribution to journal › Article › peer-review

182 Scopus citations

Abstract

Understanding new superconductors requires high-quality epitaxial thin films to explore intrinsic electromagnetic properties and evaluate device applications^1-9. So far, superconducting properties of ferropnictide thin films seem compromised by imperfect epitaxial growth and poor connectivity of the superconducting phase^10-14. 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 BaFe₂ As₂ with a high transition temperature (T _cp,=0 of 21.5 K, where =resistivity), a small transition width (ΔT_c =1.3 K), a superior critical current density J_c 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.

Original language	English
Pages (from-to)	397-402
Number of pages	6
Journal	Nature Materials
Volume	9
Issue number	5
DOIs	https://doi.org/10.1038/nmat2721
State	Published - May 2010
Externally published	Yes

Funding

We are grateful to J. Fournelle, M. Putti, A. Xu, F. Kametani, A. Gurevich, P. Li and V. Griffin for discussions and experimental help. Work at the University of Wisconsin was supported by funding from the DOE Office of Basic Energy Sciences under award number DE-FG02-06ER46327, and that at the NHMFL was supported under NSF Cooperative Agreement DMR-0084173, by the State of Florida and by AFOSR under grant FA9550-06-1-0474. A.Y. is supported by a fellowship of the Japan Society for the Promotion of Science. All TEM work was carried out at the University of Michigan and was supported by the Department of Energy under grant DE-FG02-07ER46416.

Funders	Funder number
State of Florida
National Science Foundation	DMR-0084173
U.S. Department of Energy	DE-FG02-07ER46416
Directorate for Mathematical and Physical Sciences	0084173
Air Force Office of Scientific Research	FA9550-06-1-0474
Basic Energy Sciences	DE-FG02-06ER46327
Japan Society for the Promotion of Science

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10.1038/nmat2721

Cite this

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. (2010). Template engineering of Co-doped BaFe₂ As ₂ single-crystal thin films. Nature Materials, 9(5), 397-402. https://doi.org/10.1038/nmat2721

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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 BaFe2 As2 with a high transition temperature (T cp,=0 of 21.5 K, where =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.",

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