Orbital selective pairing and gap structures of iron-based superconductors

Andreas Kreisel; Brian Møller Andersen; Peter O. Sprau; Andrey Kostin; J. C.Séamus  Davis; P.J. Hirschfeld

doi:10.1103/physrevb.95.174504

Orbital selective pairing and gap structures of iron-based superconductors

Andreas Kreisel, Brian Møller Andersen, Peter O. Sprau, Andrey Kostin, J. C.Séamus Davis, P.J. Hirschfeld

Xray and Neutron Science

77 Citations (Scopus)

Abstract

We discuss the influence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation theory via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.

Original language	English
Article number	174504
Journal	Physical Review B
Volume	95
ISSN	2469-9950
DOIs	https://doi.org/10.1103/physrevb.95.174504
Publication status	Published - 8 May 2017

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PhysRevB.95.174504Final published version, 1.19 MB

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title = "Orbital selective pairing and gap structures of iron-based superconductors",

abstract = "We discuss the influence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation theory via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.",

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T1 - Orbital selective pairing and gap structures of iron-based superconductors

AU - Kreisel, Andreas

AU - Andersen, Brian Møller

AU - Sprau, Peter O.

AU - Kostin, Andrey

AU - Davis, J. C.Séamus

AU - Hirschfeld, P.J.

PY - 2017/5/8

Y1 - 2017/5/8

N2 - We discuss the influence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation theory via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.

AB - We discuss the influence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation theory via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.

U2 - 10.1103/physrevb.95.174504

DO - 10.1103/physrevb.95.174504

M3 - Journal article

SN - 2469-9950

VL - 95

JO - Physical Review B

JF - Physical Review B

M1 - 174504

ER -

Orbital selective pairing and gap structures of iron-based superconductors

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