Superconductivity in Ca1-xLaxFeAs2: A novel 112-type iron pnictide with arsenic zigzag bonds

Naoyuki Katayama, Kazutaka Kudo, Seiichiro Onari, Tasuku Mizukami, Kento Sugawara, Yuki Sugiyama, Yutaka Kitahama, Keita Iba, Kazunori Fujimura, Naoki Nishimoto, Minoru Nohara, Hiroshi Sawa

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135 Citations (Scopus)


We report superconductivity in the novel 112-type iron-based compound Ca1-xLaxFeAs2. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in a monoclinic structure (space group P21), in which Fe2As2 layers alternate with Ca2As2 spacer layers such that monovalent arsenic forms zigzag chains. Superconductivity with a transition temperature (Tc) of 34K was observed for the x = 0.1 sample, while the x = 0.21 sample exhibited trace superconductivity at 45 K. First-principles band calculations demonstrated the presence of almost cylindrical Fermi surfaces, favorable for the high Tc in La-doped CaFeAs2.

Original languageEnglish
Article number123702
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - Dec 2013


  • 112-type
  • Ca-La-Fe-As
  • CaFeAs
  • Iron-based superconductors

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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