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The local electronic and magnetic properties of superconducting FeSe havebeen investigated by K$\beta$ x-ray emission (XES) and simultaneous x-rayabsorption spectroscopy (XAS) at the Fe K-edge at high pressure and lowtemperature. Our results indicate a sluggish decrease of the local Fe spinmoment under pressure up to 7~GPa, in line with previous reports, followed by asudden increase at higher pressure which has been hitherto unobserved. Themagnetic surge is preceded by an abrupt change of the Fe local structure asobserved by the decrease of the XAS pre-edge region intensity and corroboratedby ab-initio simulations. This pressure corresponds to a structural transition,previously detected by x-ray diffraction, from the $Cmma$ form to the denser$Pbnm$ form with octahedral coordination of iron. Finally, the near-edge regionof the XAS spectra shows a change before this transition at 5~GPa,corresponding well with the onset pressure of the previously observedenhancement of $T_c$. Our results emphasize the delicate interplay betweenstructural, magnetic, and superconducting properties in FeSe under pressure.

Emergent high-spin state above 7 GPa in superconducting FeSe