Strong $(\pi ,0)$ spin fluctuations in $\beta$-FeSe observed by neutron spectroscopy

Abstract

We have performed powder inelastic neutron scattering measurements on the unconventional superconductor $\beta$-FeSe ($T_{\mathrm{c}}\simeq 8\mathrm{K}$). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector $(\pi ,0)$ extending beyond 80 meV in energy. Measurements as a function of temperature at an energy of $\sim 13\mathrm{meV}$ did not show any variation from $T_{\mathrm{c}}$ to $104\mathrm{K}$. The results show that FeSe is close to an instability towards $(\pi ,0)$ antiferromagnetism characteristic of the parent phases of the high-$T_{\mathrm{c}}$ iron arsenide superconductors, and that the iron paramagnetic moment is neither affected by the orthorhombic-to-tetragonal structural transition at $T_{\mathrm{s}}\simeq 90\mathrm{K}$ nor does it undergo a change in spin state over the temperature range studied.

arXiv commentRevised version, includes Supplementary Material

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