Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order

Abstract

Inelastic neutron scattering was employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at $T_{\mathrm{S}}$, sets in well above the stripe antiferromagnetic ordering at $T_{\mathrm{N}}$. We find that the temperature-dependent dynamic susceptibility displays an anomaly at $T_{\mathrm{S}}$ followed by a sharp enhancement in the spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings can be consistently described by a model that attributes the structural/nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the long-range stripe antiferromagnetic order in iron pnictides.

arXiv comment6 pages, 5 figures, 66 references, plus one Supplemental Material. Physical Review Letters, Accepted and in production

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• Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe
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