Critical quadrupole fluctuations and collective modes in iron pnictide superconductors

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dc.citation.articleNumber54515
dc.citation.issueNumber5
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber93
dc.contributor.authorThorsmølle, V.K.
dc.contributor.authorKhodas, M.
dc.contributor.authorYin, Z.P.
dc.contributor.authorZhang, Chenglin
dc.contributor.authorCarr, S.V.
dc.contributor.authorDai, Pengcheng
dc.contributor.authorBlumberg, G.
dc.date.accessioned2017-05-04T19:43:54Z
dc.date.available2017-05-04T19:43:54Z
dc.date.issued2016
dc.description.abstractThe multiband nature of iron pnictides gives rise to a rich temperature-doping phase diagram of competing orders and a plethora of collective phenomena. At low dopings, the tetragonal-to-orthorhombic structural transition is closely followed by a spin-density-wave transition both being in close proximity to the superconducting phase. A key question is the nature of high-Tc superconductivity and its relation to orbital ordering and magnetism. Here we study the NaFe1−xCoxAs superconductor using polarization-resolved Raman spectroscopy. The Raman susceptibility displays critical enhancement of nonsymmetric charge fluctuations across the entire phase diagram, which are precursors to a d-wave Pomeranchuk instability at temperature θ(x). The charge fluctuations are interpreted in terms of quadrupole interorbital excitations in which the electron and hole Fermi surfaces breathe in-phase. Below Tc, the critical fluctuations acquire coherence and undergo a metamorphosis into a coherent in-gap mode of extraordinary strength.
dc.identifier.citationThorsmølle, V.K., Khodas, M., Yin, Z.P., et al.. "Critical quadrupole fluctuations and collective modes in iron pnictide superconductors." <i>Physical Review B,</i> 93, no. 5 (2016) American Physical Society: https://doi.org/10.1103/PhysRevB.93.054515.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.93.054515
dc.identifier.urihttps://hdl.handle.net/1911/94179
dc.language.isoeng
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.titleCritical quadrupole fluctuations and collective modes in iron pnictide superconductors
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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