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

Minoru Nohara, Kazutaka Kudo

    Research output: Contribution to journalReview articlepeer-review

    7 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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