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Imaging orbital-selective quasiparticles in the Hund's metal state of FeSe

Kostin, A ; Sprau, P O ; Kreisel, A ; Chong, Yi Xue ; Böhmer, A E ; Canfield, P C ; Hirschfeld, P J ; Andersen, B M ; Davis, J C Séamus

Nature materials, 2018-10, Vol.17 (10), p.869-874 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Imaging orbital-selective quasiparticles in the Hund's metal state of FeSe
  • Autor: Kostin, A ; Sprau, P O ; Kreisel, A ; Chong, Yi Xue ; Böhmer, A E ; Canfield, P C ; Hirschfeld, P J ; Andersen, B M ; Davis, J C Séamus
  • Assuntos: ATOMIC AND MOLECULAR PHYSICS ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Copper ; Correlation analysis ; Energy ; High temperature superconductors ; Interference ; Iron ; Laboratories ; Orbitals ; Physics ; Superconductivity ; Variation
  • É parte de: Nature materials, 2018-10, Vol.17 (10), p.869-874
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC02-07CH11358; SC0012704
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    IS-J-9710; BNL-209435-2018-JAAM
  • Descrição: Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high-temperature superconductivity. By contrast, the parent phase of an iron-based high-temperature superconductor is never a correlated insulator. However, this distinction may be deceptive because Fe has five actived d orbitals while Cu has only one. In theory, such orbital multiplicity can generate a Hund's metal state, in which alignment of the Fe spins suppresses inter-orbital fluctuations, producing orbitally selective strong correlations. The spectral weights Z of quasiparticles associated with different Fe orbitals m should then be radically different. Here we use quasiparticle scattering interference resolved by orbital content to explore these predictions in FeSe. Signatures of strong, orbitally selective differences of quasiparticle Z appear on all detectable bands over a wide energy range. Further, the quasiparticle interference amplitudes reveal that [Formula: see text], consistent with earlier orbital-selective Cooper pairing studies. Thus, orbital-selective strong correlations dominate the parent state of iron-based high-temperature superconductivity in FeSe.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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