Abstract
We have investigated the local Fe electronic changes in the square planar Fe(II) compound ${\mathrm{SrFeO}}_{2}$ by x-ray emission (XES) and x-ray absorption spectroscopy (XAS) through the pressure-induced spin transition up to 60 GPa. The analysis of Fe $K\ensuremath{\beta}$ XES confirms the transition under pressure from a high spin to intermediate spin state at ${P}_{c}=43$ GPa while XAS at the Fe K edge reveals the spectral signatures of the lattice compression under pressure. Simulations of the XAS spectra point to significant changes in Fe-$p$ states across ${P}_{c}$ and highlight the active role of the Sr-$p$ states at the transition.
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