Ising-nematic order in the bilinear-biquadratic model for the iron pnictides

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dc.citation.firstpage165102en_US
dc.citation.issueNumber16en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber92en_US
dc.contributor.authorErgueta, Patricia Bilbaoen_US
dc.contributor.authorNevidomskyy, Andriy H.en_US
dc.date.accessioned2016-06-10T19:01:57Zen_US
dc.date.available2016-06-10T19:01:57Zen_US
dc.date.issued2015en_US
dc.description.abstractMotivated by the recent inelastic neutron scattering (INS) measurements in the iron pnictides which show a strong anisotropy of spin excitations even above the magnetic transition temperature TN, we study the spin dynamics within the frustrated Heisenberg model with biquadratic spin-spin exchange interactions. Using the Dyson-Maleev (DM) representation, which proves appropriate for all temperature regimes, we find that the spin-spin dynamical structure factors are in excellent agreement with experiment, exhibiting breaking of the C4 symmetry even into the paramagnetic region TN<T<Tσ, which we refer to as the Ising-nematic phase. In addition to the Heisenberg spin interaction, we include the biquadratic coupling −K(Si⋅Sj)2 and study its effect on the dynamical temperature range Tσ−TN of the Ising-nematic phase. We find that this range reduces dramatically when even small values of the interlayer exchange Jc and biquadratic coupling K are included. To supplement our analysis, we benchmark the results obtained using full decoupling in the DM method against those from different nonlinear spin-wave theories, including the recently developed generalized spin-wave theory (GSWT), and find good qualitative agreement among the different theoretical approaches as well as experiment for both the spin-wave dispersions and the dynamical structure factors.en_US
dc.identifier.citationErgueta, Patricia Bilbao and Nevidomskyy, Andriy H.. "Ising-nematic order in the bilinear-biquadratic model for the iron pnictides." <i>Physical Review B,</i> 92, no. 16 (2015) American Physical Society: 165102. http://dx.doi.org/10.1103/PhysRevB.92.165102.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.92.165102en_US
dc.identifier.urihttps://hdl.handle.net/1911/90497en_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.titleIsing-nematic order in the bilinear-biquadratic model for the iron pnictidesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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