Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

Rastko Sknepnek, German Samolyuk, Yong-bin Lee, Joerg Schmalian

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

    Original languageEnglish
    Article numberARTN 054511
    Number of pages9
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume79
    Issue number5
    DOIs
    Publication statusPublished - Feb 2009

    Keywords

    • Systems
    • Type II superconductors
    • Magnetic anisotropy
    • Fluctuations in superconductors
    • Order
    • Iron compounds
    • Fermi surface

    Cite this

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    title = "Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations",
    abstract = "We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.",
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    Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations. / Sknepnek, Rastko; Samolyuk, German; Lee, Yong-bin; Schmalian, Joerg.

    In: Physical Review B: Condensed Matter and Materials Physics, Vol. 79, No. 5, ARTN 054511, 02.2009.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

    AU - Sknepnek, Rastko

    AU - Samolyuk, German

    AU - Lee, Yong-bin

    AU - Schmalian, Joerg

    PY - 2009/2

    Y1 - 2009/2

    N2 - We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

    AB - We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

    KW - Systems

    KW - Type II superconductors

    KW - Magnetic anisotropy

    KW - Fluctuations in superconductors

    KW - Order

    KW - Iron compounds

    KW - Fermi surface

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    DO - 10.1103/PhysRevB.79.054511

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    JO - Physical Review B: Condensed Matter and Materials Physics

    JF - Physical Review B: Condensed Matter and Materials Physics

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