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dc.contributor.authorThorsmølle, V.K.
Khodas, M.
Yin, Z.P.
Zhang, Chenglin
Carr, S.V.
Dai, Pengcheng
Blumberg, G.
dc.date.accessioned 2017-05-04T19:43:54Z
dc.date.available 2017-05-04T19:43:54Z
dc.date.issued 2016
dc.identifier.citation Thorsmølle, V.K., Khodas, M., Yin, Z.P., et al.. "Critical quadrupole fluctuations and collective modes in iron pnictide superconductors." Physical Review B, 93, no. 5 (2016) https://doi.org/10.1103/PhysRevB.93.054515.
dc.identifier.urihttp://hdl.handle.net/1911/94179
dc.description.abstract The 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.language.iso eng
dc.rights Article 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.title Critical quadrupole fluctuations and collective modes in iron pnictide superconductors
dc.type Journal article
dc.citation.journalTitle Physical Review B
dc.citation.volumeNumber 93
dc.citation.issueNumber 5
dc.contributor.publisher American Physical Society
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.93.054515
dc.type.publication publisher version
dc.citation.articleNumber 054515


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