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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106 Citations (Scopus)

Abstract

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
Volume82
Issue number12
DOIs
Publication statusPublished - Dec 1 2013

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Katayama, N., Kudo, K., Onari, S., Mizukami, T., Sugawara, K., Sugiyama, Y., Kitahama, Y., Iba, K., Fujimura, K., Nishimoto, N., Nohara, M., & Sawa, H. (2013). Superconductivity in Ca1-xLaxFeAs2: A novel 112-type iron pnictide with arsenic zigzag bonds. journal of the physical society of japan, 82(12), [123702]. https://doi.org/10.7566/JPSJ.82.123702