Critical quadrupole fluctuations and collective modes in iron pnictide superconductors

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dc.citation.articleNumber54515en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber93en_US
dc.contributor.authorThorsmølle, V.K.en_US
dc.contributor.authorKhodas, M.en_US
dc.contributor.authorYin, Z.P.en_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorCarr, S.V.en_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorBlumberg, G.en_US
dc.date.accessioned2017-05-04T19:43:54Zen_US
dc.date.available2017-05-04T19:43:54Zen_US
dc.date.issued2016en_US
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.en_US
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.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.93.054515en_US
dc.identifier.urihttps://hdl.handle.net/1911/94179en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
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.en_US
dc.titleCritical quadrupole fluctuations and collective modes in iron pnictide superconductorsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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