Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials

Minoru Nohara, Kazutaka Kudo

Research output: Contribution to journalReview articlepeer-review

6 Citations (Scopus)


The progress of materials discovery of iron-based superconductors is reviewed with the emphasis on the valence states and chemical bonds of arsenic. We demonstrate that monovalent As produces the 112-type CaFeAs2 with arsenic zigzag chains. When co-doping of La and Sb is performed, the superconducting transition temperature rises to 47 K. In the 10-4-8-type Ca10(Pt4As8)(Fe2−xPtxAs2)5, the divalent As2– produces As2 molecules, and creates an interlayer substance with PtAs4 planar squares. The maximum superconducting transition temperature is 38 K. In the 122-type CaFe2As2, Rh doping induces a lattice collapse transition accompanying the formation of As2 molecules between the adjacent FeAs layers. This transition can be viewed as a valence transition between As3– and As2–. These properties of arsenic that produces various chemical bonds can be used to create new superconducting materials.

Original languageEnglish
Pages (from-to)450-461
Number of pages12
JournalAdvances in Physics: X
Issue number2
Publication statusPublished - Mar 4 2017


  • 74.10.+v Occurrence, potential candidates
  • 74.25.Dw Superconductivity phase diagrams
  • 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
  • 74.70.Xa Pnictides and chalcogenides
  • Iron-based superconductors
  • lattice collapse transitions
  • layered structures
  • pnictides
  • valence transitions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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