Publication Date

9-3-2018

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Physics and Astronomy, Ames Laboratory

OSTI ID+

1477246

Report Number

IS-J 9710; BNL-209435-2018-JAAM

DOI

10.1038/s41563-018-0151-0

Journal Title

Nature Materials

Volume Number

17

First Page

869

Last Page

874

Abstract

Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high temperature superconductivity (HTS). By contrast, the parent phase of iron-based HTS is never a correlated insulator. But this distinction may be deceptive because Fe has five active 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 𝒁𝒎 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 𝒁𝒎 appear on all detectable bands over a wide energy range. Further, the quasiparticle interference amplitudes reveal that 𝒁𝒙𝒚 < 𝒁𝒙𝒛 ≪ 𝒁𝒚𝒛 , consistent with earlier orbital-selective Cooper pairing studies. Thus, orbital-selective strong correlations dominate the parent state of iron-based HTS in FeSe.

DOE Contract Number(s)

AC02-07CH11358; SC0012704

Language

en

Department of Energy Subject Categories

74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Share

COinS