Coherence effect in a two-band superconductor: Application to iron pnictides

Keisuke Masuda, Susumu Kurihara

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    From a theoretical point of view, we propose an experimental method to determine the pairing symmetry of iron pnictides. We focus on two kinds of pairing symmetries, s+- and s++, which are strong candidates for the pairing symmetry of iron pnictides. For each of these two symmetries, we calculate both the density and spin response functions by using the two-band BCS model within the one-loop approximation. As a result, a clear difference is found between the s+- and s++-wave states in the temperature dependence of the response functions at nesting vector Q, which connects the hole and electron Fermi surfaces. We point out that this difference comes from the coherence effect in the twoband superconductor. We suggest that the pairing symmetry could be clarified by observing the temperature dependence of both the density and spin structure factors at the nesting vector Q in neutron scattering measurements.

    Original languageEnglish
    Article number074710
    JournalJournal of the Physical Society of Japan
    Volume79
    Issue number7
    DOIs
    Publication statusPublished - 2010 Jul

    Fingerprint

    Group 5A compounds
    iron
    symmetry
    temperature dependence
    Fermi surfaces
    neutron scattering
    approximation
    electrons

    Keywords

    • Coherence effect
    • Iron-pnictide superconductors
    • Pairing symmetry
    • Response functions
    • Two-band BCS model

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Coherence effect in a two-band superconductor : Application to iron pnictides. / Masuda, Keisuke; Kurihara, Susumu.

    In: Journal of the Physical Society of Japan, Vol. 79, No. 7, 074710, 07.2010.

    Research output: Contribution to journalArticle

    @article{1ca200bc8e224c479bdf737cd54be7cd,
    title = "Coherence effect in a two-band superconductor: Application to iron pnictides",
    abstract = "From a theoretical point of view, we propose an experimental method to determine the pairing symmetry of iron pnictides. We focus on two kinds of pairing symmetries, s+- and s++, which are strong candidates for the pairing symmetry of iron pnictides. For each of these two symmetries, we calculate both the density and spin response functions by using the two-band BCS model within the one-loop approximation. As a result, a clear difference is found between the s+- and s++-wave states in the temperature dependence of the response functions at nesting vector Q, which connects the hole and electron Fermi surfaces. We point out that this difference comes from the coherence effect in the twoband superconductor. We suggest that the pairing symmetry could be clarified by observing the temperature dependence of both the density and spin structure factors at the nesting vector Q in neutron scattering measurements.",
    keywords = "Coherence effect, Iron-pnictide superconductors, Pairing symmetry, Response functions, Two-band BCS model",
    author = "Keisuke Masuda and Susumu Kurihara",
    year = "2010",
    month = "7",
    doi = "10.1143/JPSJ.79.074710",
    language = "English",
    volume = "79",
    journal = "Journal of the Physical Society of Japan",
    issn = "0031-9015",
    publisher = "Physical Society of Japan",
    number = "7",

    }

    TY - JOUR

    T1 - Coherence effect in a two-band superconductor

    T2 - Application to iron pnictides

    AU - Masuda, Keisuke

    AU - Kurihara, Susumu

    PY - 2010/7

    Y1 - 2010/7

    N2 - From a theoretical point of view, we propose an experimental method to determine the pairing symmetry of iron pnictides. We focus on two kinds of pairing symmetries, s+- and s++, which are strong candidates for the pairing symmetry of iron pnictides. For each of these two symmetries, we calculate both the density and spin response functions by using the two-band BCS model within the one-loop approximation. As a result, a clear difference is found between the s+- and s++-wave states in the temperature dependence of the response functions at nesting vector Q, which connects the hole and electron Fermi surfaces. We point out that this difference comes from the coherence effect in the twoband superconductor. We suggest that the pairing symmetry could be clarified by observing the temperature dependence of both the density and spin structure factors at the nesting vector Q in neutron scattering measurements.

    AB - From a theoretical point of view, we propose an experimental method to determine the pairing symmetry of iron pnictides. We focus on two kinds of pairing symmetries, s+- and s++, which are strong candidates for the pairing symmetry of iron pnictides. For each of these two symmetries, we calculate both the density and spin response functions by using the two-band BCS model within the one-loop approximation. As a result, a clear difference is found between the s+- and s++-wave states in the temperature dependence of the response functions at nesting vector Q, which connects the hole and electron Fermi surfaces. We point out that this difference comes from the coherence effect in the twoband superconductor. We suggest that the pairing symmetry could be clarified by observing the temperature dependence of both the density and spin structure factors at the nesting vector Q in neutron scattering measurements.

    KW - Coherence effect

    KW - Iron-pnictide superconductors

    KW - Pairing symmetry

    KW - Response functions

    KW - Two-band BCS model

    UR - http://www.scopus.com/inward/record.url?scp=77956248913&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=77956248913&partnerID=8YFLogxK

    U2 - 10.1143/JPSJ.79.074710

    DO - 10.1143/JPSJ.79.074710

    M3 - Article

    AN - SCOPUS:77956248913

    VL - 79

    JO - Journal of the Physical Society of Japan

    JF - Journal of the Physical Society of Japan

    SN - 0031-9015

    IS - 7

    M1 - 074710

    ER -