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The formation of nano-layered grains and their enhanced superconducting transition temperature in Mg-doped FeSe0.9 bulks

Journal Article


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Abstract


  • To search a proper dopant to further improve superconductivity in 11 type Fe-based superconductors makes sense to both their superconductivity mechanism and possible technological applications. In present work, Mg doped FeSe polycrystalline bulks were obtained by a two-step solid-state reaction method. Even though there are many MgSe and iron impurities existing in the Mg heavy doped FeSe bulks, they exhibit obviously increased T-c compared to undoped FeSe sample. It was found that Mg addition has little effect on the crystal lattice parameters of superconducting beta-FeSe, whereas leads to the formation of nano-layered grain structure consisted of MgSe and beta-FeSe with similar X-ray diffraction characteristics. Lots of nano-structural interfaces between FeSe and MgSe formed in this homogenous layered grain structure have significant effect on the superconducting properties and are responsible for the enhancement of T-c, as like the case of FeSe thin film on some specific substrates. Our work not only demonstrates a powerful way for raising T-c in bulk superconductors, but also provides a well-defined platform for systematic studies of the mechanism of unconventional superconductivity by considering interface effect.

Authors


  •   Lan, Feng (external author)
  •   Ma, Zongqing (external author)
  •   Liu, Yongchang (external author)
  •   Chen, Ning (external author)
  •   Cai, Qi (external author)
  •   Li, Hui Jun.
  •   Barua, Shaon (external author)
  •   Patel, Dipakkumar (external author)
  •   Hossain, Md Shahriar
  •   Kim, Jung Ho
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Lan, F., Ma, Z., Liu, Y., Chen, N., Cai, Q., Li, H., Barua, S., Patel, D., Hossain, M. Al., Kim, J. & Dou, S. Xue. (2014). The formation of nano-layered grains and their enhanced superconducting transition temperature in Mg-doped FeSe0.9 bulks. Scientific Reports, 4 1-5.

Scopus Eid


  • 2-s2.0-84923377542

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2306&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1305

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 1

End Page


  • 5

Volume


  • 4

Place Of Publication


  • United Kingdom

Abstract


  • To search a proper dopant to further improve superconductivity in 11 type Fe-based superconductors makes sense to both their superconductivity mechanism and possible technological applications. In present work, Mg doped FeSe polycrystalline bulks were obtained by a two-step solid-state reaction method. Even though there are many MgSe and iron impurities existing in the Mg heavy doped FeSe bulks, they exhibit obviously increased T-c compared to undoped FeSe sample. It was found that Mg addition has little effect on the crystal lattice parameters of superconducting beta-FeSe, whereas leads to the formation of nano-layered grain structure consisted of MgSe and beta-FeSe with similar X-ray diffraction characteristics. Lots of nano-structural interfaces between FeSe and MgSe formed in this homogenous layered grain structure have significant effect on the superconducting properties and are responsible for the enhancement of T-c, as like the case of FeSe thin film on some specific substrates. Our work not only demonstrates a powerful way for raising T-c in bulk superconductors, but also provides a well-defined platform for systematic studies of the mechanism of unconventional superconductivity by considering interface effect.

Authors


  •   Lan, Feng (external author)
  •   Ma, Zongqing (external author)
  •   Liu, Yongchang (external author)
  •   Chen, Ning (external author)
  •   Cai, Qi (external author)
  •   Li, Hui Jun.
  •   Barua, Shaon (external author)
  •   Patel, Dipakkumar (external author)
  •   Hossain, Md Shahriar
  •   Kim, Jung Ho
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Lan, F., Ma, Z., Liu, Y., Chen, N., Cai, Q., Li, H., Barua, S., Patel, D., Hossain, M. Al., Kim, J. & Dou, S. Xue. (2014). The formation of nano-layered grains and their enhanced superconducting transition temperature in Mg-doped FeSe0.9 bulks. Scientific Reports, 4 1-5.

Scopus Eid


  • 2-s2.0-84923377542

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2306&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1305

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 1

End Page


  • 5

Volume


  • 4

Place Of Publication


  • United Kingdom