NaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction

Simple item page
dc.citation.articleNumber97001
dc.citation.journalTitlePhysical Review Lettersen_US
dc.citation.volumeNumber117en_US
dc.contributor.authorMatt, C.E.en_US
dc.contributor.authorXu, N.en_US
dc.contributor.authorLv, Baiqingen_US
dc.contributor.authorMa, Junzhangen_US
dc.contributor.authorBisti, F.en_US
dc.contributor.authorPark, J.en_US
dc.contributor.authorShang, T.en_US
dc.contributor.authorCao, Chongdeen_US
dc.contributor.authorSong, Yuen_US
dc.contributor.authorNevidomskyy, Andriy H.en_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorPatthey, L.en_US
dc.contributor.authorPlumb, N.C.en_US
dc.contributor.authorRadovic, M.en_US
dc.contributor.authorMesot, J.en_US
dc.contributor.authorShi, M.en_US
dc.date.accessioned2017-02-22T21:07:14Z
dc.date.available2017-02-22T21:07:14Z
dc.date.issued2016en_US
dc.description.abstractIn the studies of iron pnictides, a key question is whether their bad-metal state from which the superconductivity emerges lies in close proximity with a magnetically ordered insulating phase. Recently, it was found that at low temperatures, the heavily Cu-doped NaFe1−xCuxAs (x>0.3) iron pnictide is an insulator with long-range antiferromagnetic order, similar to the parent compound of cuprates but distinct from all other iron pnictides. Using angle-resolved photoemission spectroscopy, we determined the momentum-resolved electronic structure of NaFe1−xCuxAs (x=0.44) and identified that its ground state is a narrow-gap insulator. Combining the experimental results with density functional theory (DFT) and DFT+U calculations, our analysis reveals that the on-site Coulombic (Hubbard) and Hund’s coupling energies play crucial roles in the formation of the band gap about the chemical potential. We propose that at finite temperatures, charge carriers are thermally excited from the Cu-As-like valence band into the conduction band, which is of Fe 3d-like character. With increasing temperature, the number of electrons in the conduction band becomes larger and the hopping energy between Fe sites increases, and finally the long-range antiferromagnetic order is destroyed at T>TN. Our study provides a basis for investigating the evolution of the electronic structure of a Mott insulator transforming into a bad metallic phase and eventually forming a superconducting state in iron pnictides.en_US
dc.identifier.citationMatt, C.E., Xu, N., Lv, Baiqing, et al.. "NaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction." <i>Physical Review Letters,</i> 117, (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevLett.117.097001.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.117.097001en_US
dc.identifier.urihttps://hdl.handle.net/1911/93959
dc.language.isoengen_US
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleNaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interactionen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
local.sword.agentConverisen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
PhysRevLett.117.097001.pdf
Size:
1.39 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Faculty Publications
Physics and Astronomy Publications