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Absence of long wavelength nematic fluctuations in LiFeAs

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arxiv 1611.02748 v1 pith:2YAS5RI3 submitted 2016-11-08 cond-mat.supr-con

Absence of long wavelength nematic fluctuations in LiFeAs

Adrian Merritt , Jose Rodriguez-Rivera , Yu Li , Weiyi Wang , Chenglin Zhang , Pengcheng Dai , Dmitry Rezik This is my paper
classification cond-mat.supr-con
keywords fluctuationsnematicabsencelifeasphononsacousticbehaviorconventional
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We investigated long-wavelength nematic fluctuations in an Fe-based superconductor LiFeAs near q=(0.05,0,0) by measuring temperature-dependent renormalization of acoustic phonons through inelastic neutron scattering. We found that the phonons have conventional behavior, as would be expected in the absence of electronic nematic fluctuations. This observation implies that either electron-phonon coupling is too weak to see any effect or that nematic fluctuations are not present.

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