Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir)

E. Paris, T. Wakita, O. Proux, T. Yokoya, K. Kudo, D. Mitsuoka, T. Kimura, K. Fujimura, N. Nishimoto, S. Ioka, M. Nohara, Takashi Mizokawa, N. L. Saini

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We have studied the local structure of superconducting Ca10Pt4As8(Fe2As2)5 (Pt10418) and Ca10Ir4As8(Fe2As2)5 (Ir10418) iron arsenides, showing different transition temperatures (Tc=38 and 16 K, respectively), by polarized Fe K-edge extended x-ray absorption fine-structure measurements. Despite the similar average crystal structures, the local structures of the FeAs4 tetrahedra in the two compounds are found to be very different. The FeAs4 in Pt10418 is close to a regular tetrahedron, while it deviates largely in Ir10418. The Fe-Fe correlations in the two compounds are characterized by similar bond-length characteristics; however, the static disorder in Pt10418 is significantly lower than that in Ir10418. The results suggest that the optimized local structure and reduced disorder are the reasons for higher Tc and well-defined electronic states in Pt10418 unlike Ir10418 showing the coexistence of glassy and normal electrons at the Fermi surface, and hence provide direct evidence of the local-structure-driven optimization of the electronic structure and superconductivity in iron arsenides.

    Original languageEnglish
    Article number224507
    JournalPhysical Review B
    Volume96
    Issue number22
    DOIs
    Publication statusPublished - 2017 Dec 15

    Fingerprint

    arsenides
    tetrahedrons
    disorders
    iron
    Iron
    x ray absorption
    Fermi surfaces
    superconductivity
    Fermi surface
    fine structure
    transition temperature
    Bond length
    Electronic states
    electronic structure
    Superconductivity
    Superconducting transition temperature
    crystal structure
    optimization
    Electronic structure
    Crystal structure

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Paris, E., Wakita, T., Proux, O., Yokoya, T., Kudo, K., Mitsuoka, D., ... Saini, N. L. (2017). Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir). Physical Review B, 96(22), [224507]. https://doi.org/10.1103/PhysRevB.96.224507

    Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir). / Paris, E.; Wakita, T.; Proux, O.; Yokoya, T.; Kudo, K.; Mitsuoka, D.; Kimura, T.; Fujimura, K.; Nishimoto, N.; Ioka, S.; Nohara, M.; Mizokawa, Takashi; Saini, N. L.

    In: Physical Review B, Vol. 96, No. 22, 224507, 15.12.2017.

    Research output: Contribution to journalArticle

    Paris, E, Wakita, T, Proux, O, Yokoya, T, Kudo, K, Mitsuoka, D, Kimura, T, Fujimura, K, Nishimoto, N, Ioka, S, Nohara, M, Mizokawa, T & Saini, NL 2017, 'Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir)', Physical Review B, vol. 96, no. 22, 224507. https://doi.org/10.1103/PhysRevB.96.224507
    Paris E, Wakita T, Proux O, Yokoya T, Kudo K, Mitsuoka D et al. Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir). Physical Review B. 2017 Dec 15;96(22). 224507. https://doi.org/10.1103/PhysRevB.96.224507
    Paris, E. ; Wakita, T. ; Proux, O. ; Yokoya, T. ; Kudo, K. ; Mitsuoka, D. ; Kimura, T. ; Fujimura, K. ; Nishimoto, N. ; Ioka, S. ; Nohara, M. ; Mizokawa, Takashi ; Saini, N. L. / Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir). In: Physical Review B. 2017 ; Vol. 96, No. 22.
    @article{78224a6f6ac04a4bbe2ae768070e5646,
    title = "Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir)",
    abstract = "We have studied the local structure of superconducting Ca10Pt4As8(Fe2As2)5 (Pt10418) and Ca10Ir4As8(Fe2As2)5 (Ir10418) iron arsenides, showing different transition temperatures (Tc=38 and 16 K, respectively), by polarized Fe K-edge extended x-ray absorption fine-structure measurements. Despite the similar average crystal structures, the local structures of the FeAs4 tetrahedra in the two compounds are found to be very different. The FeAs4 in Pt10418 is close to a regular tetrahedron, while it deviates largely in Ir10418. The Fe-Fe correlations in the two compounds are characterized by similar bond-length characteristics; however, the static disorder in Pt10418 is significantly lower than that in Ir10418. The results suggest that the optimized local structure and reduced disorder are the reasons for higher Tc and well-defined electronic states in Pt10418 unlike Ir10418 showing the coexistence of glassy and normal electrons at the Fermi surface, and hence provide direct evidence of the local-structure-driven optimization of the electronic structure and superconductivity in iron arsenides.",
    author = "E. Paris and T. Wakita and O. Proux and T. Yokoya and K. Kudo and D. Mitsuoka and T. Kimura and K. Fujimura and N. Nishimoto and S. Ioka and M. Nohara and Takashi Mizokawa and Saini, {N. L.}",
    year = "2017",
    month = "12",
    day = "15",
    doi = "10.1103/PhysRevB.96.224507",
    language = "English",
    volume = "96",
    journal = "Physical Review B-Condensed Matter",
    issn = "2469-9950",
    publisher = "American Physical Society",
    number = "22",

    }

    TY - JOUR

    T1 - Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir)

    AU - Paris, E.

    AU - Wakita, T.

    AU - Proux, O.

    AU - Yokoya, T.

    AU - Kudo, K.

    AU - Mitsuoka, D.

    AU - Kimura, T.

    AU - Fujimura, K.

    AU - Nishimoto, N.

    AU - Ioka, S.

    AU - Nohara, M.

    AU - Mizokawa, Takashi

    AU - Saini, N. L.

    PY - 2017/12/15

    Y1 - 2017/12/15

    N2 - We have studied the local structure of superconducting Ca10Pt4As8(Fe2As2)5 (Pt10418) and Ca10Ir4As8(Fe2As2)5 (Ir10418) iron arsenides, showing different transition temperatures (Tc=38 and 16 K, respectively), by polarized Fe K-edge extended x-ray absorption fine-structure measurements. Despite the similar average crystal structures, the local structures of the FeAs4 tetrahedra in the two compounds are found to be very different. The FeAs4 in Pt10418 is close to a regular tetrahedron, while it deviates largely in Ir10418. The Fe-Fe correlations in the two compounds are characterized by similar bond-length characteristics; however, the static disorder in Pt10418 is significantly lower than that in Ir10418. The results suggest that the optimized local structure and reduced disorder are the reasons for higher Tc and well-defined electronic states in Pt10418 unlike Ir10418 showing the coexistence of glassy and normal electrons at the Fermi surface, and hence provide direct evidence of the local-structure-driven optimization of the electronic structure and superconductivity in iron arsenides.

    AB - We have studied the local structure of superconducting Ca10Pt4As8(Fe2As2)5 (Pt10418) and Ca10Ir4As8(Fe2As2)5 (Ir10418) iron arsenides, showing different transition temperatures (Tc=38 and 16 K, respectively), by polarized Fe K-edge extended x-ray absorption fine-structure measurements. Despite the similar average crystal structures, the local structures of the FeAs4 tetrahedra in the two compounds are found to be very different. The FeAs4 in Pt10418 is close to a regular tetrahedron, while it deviates largely in Ir10418. The Fe-Fe correlations in the two compounds are characterized by similar bond-length characteristics; however, the static disorder in Pt10418 is significantly lower than that in Ir10418. The results suggest that the optimized local structure and reduced disorder are the reasons for higher Tc and well-defined electronic states in Pt10418 unlike Ir10418 showing the coexistence of glassy and normal electrons at the Fermi surface, and hence provide direct evidence of the local-structure-driven optimization of the electronic structure and superconductivity in iron arsenides.

    UR - http://www.scopus.com/inward/record.url?scp=85039423652&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85039423652&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevB.96.224507

    DO - 10.1103/PhysRevB.96.224507

    M3 - Article

    AN - SCOPUS:85039423652

    VL - 96

    JO - Physical Review B-Condensed Matter

    JF - Physical Review B-Condensed Matter

    SN - 2469-9950

    IS - 22

    M1 - 224507

    ER -