Suppression of the magnetic order in CeFeAsO: non-equivalence of hydrostatic and chemical pressure

TL;DR

This study compares the effects of chemical and hydrostatic pressure on CeFeAsO, revealing that they differently influence the suppression of magnetic order and alter the material's electronic and structural properties.

Contribution

It demonstrates that chemical and hydrostatic pressures are not equivalent in CeFeAsO, showing distinct impacts on its electronic and magnetic properties.

Findings

Magnetic order is suppressed above 40% P substitution or 5.2 GPa pressure.

Chemical and hydrostatic pressures differently affect the crystallographic and electronic properties.

No magnetic order observed beyond certain pressure thresholds.

Abstract

We present a detailed investigation of the electronic properties of CeFeAsO under chemical (As by P substitution) and hydrostatic pressure by means of in-house and synchrotron M\"ossbauer spectroscopy. The Fe magnetism is suppressed due to both pressures and no magnetic order was observed above a P-substitution level of 40% or 5.2 GPa hydrostatic pressure. We compared both pressures and found that the isovalent As by P substitution change the crystallographic and electronic properties differently than hydrostatic pressure.