Pressure induced high-spin to low-spin transition in FeS evidenced by x-ray emission spectroscopy

TL;DR

This study uses advanced x-ray emission spectroscopy to observe a reversible pressure-induced transition from high-spin to low-spin states in FeS, linking electronic and structural phase changes under high pressure.

Contribution

It provides the first direct spectroscopic evidence of the high-spin to low-spin transition in FeS under pressure, revealing its relation to structural phase transitions.

Findings

High-spin to low-spin transition observed in FeS under pressure

Transition is reversible and linked to structural change

New spectroscopy techniques enable detailed electronic analysis

Abstract

We report the observation of the pressure-induced high-spin to low-spin transition in FeS using new high-pressure synchrotron x-ray emission spectroscopy techniques. The transition is evidenced by the disappearance of the low-energy satellite in the Fe K$\beta$ emission spectrum of FeS. Moreover, the phase transition is reversible and closely related to the structural phase transition from a manganese phosphide-like phase to a monoclinic phase. The study opens new opportunities for investigating the electronic properties of materials under pressure.