MBE growth of Fe-based superconducting films

S. Ueda, T. Yamagishi, S. Takeda, S. Agatsuma, S. Takano, A. Mitsuda, M. Naito

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Abstract

We report MBE growth of the iron-based superconductors, Sr 1-xKxFe2As2, Ba 1-xKxFe2As2, and SmFeAs(O,F). In the growth of Sr1-xKxFe 2As2 and Ba1-xKxFe 2As2 films, the key to incorporating volatile K in films is low-temperature (300-350 °C) growth in reduced As flux. The highest Tc so far obtained are Tcon(Tcend)=33.4K (31.0 K) and 38.3 K (35.5 K) for Sr1-xKxFe2As2 and Ba1-xKxFe2As2, respectively. In the growth of superconducting SmFeAs(O,F), we have adopted two approaches. In the first approach, we first grew F-free SmFeAsO films, and subsequently introduced F to the films via F diffusion from an overlayer of SmF3 or NdF3. In the second approach, we attempted the growth of as-grown superconducting SmFeAs(O,F) films by coevaporating Sm, SmF3, Fe, and As. In both the approaches, the growth temperature was as high as 650 °C. So far better results have been obtained by the first F diffusion method. The films prepared by F diffusion showed Tcon (Tcend) = 52 K (48.6 K) whereas the as-grown films showed Tcon = 47 K but with a long transition tail.

Original languageEnglish
Pages (from-to)1167-1173
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - Nov 1 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Ueda, S., Yamagishi, T., Takeda, S., Agatsuma, S., Takano, S., Mitsuda, A., & Naito, M. (2011). MBE growth of Fe-based superconducting films. Physica C: Superconductivity and its applications, 471(21-22), 1167-1173. https://doi.org/10.1016/j.physc.2011.05.150