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

X-ray and Neutron Science

77 Citationer (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.

Originalsprog	Engelsk
Artikelnummer	174504
Tidsskrift	Physical Review B
Vol/bind	95
ISSN	2469-9950
DOI	https://doi.org/10.1103/physrevb.95.174504
Status	Udgivet - 8 maj 2017

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10.1103/physrevb.95.174504

PhysRevB.95.174504Forlagets udgivne version, 1,19 MB

http://arxiv.org/pdf/1611.02643Licens: Andet

Citationsformater

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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.

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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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