Pressure dependence of the exchange interaction in the dimeric single-molecule magnet [Mn4O3Cl4(O2CEt)3(py)3]2 from inelastic neutron scattering

TL;DR

This study investigates how hydrostatic pressure affects magnetic interactions in a Mn4-based single-molecule magnet, revealing that exchange coupling increases significantly with pressure while anisotropy remains stable.

Contribution

It provides new insights into the pressure dependence of exchange interactions in single-molecule magnets using inelastic neutron scattering and structural analysis.

Findings

Exchange coupling J increases by 42% at 17 kbar

Anisotropy parameters D and B04 are pressure independent

Structural changes correlate with magnetic interaction variations

Abstract

The low-lying magnetic excitations in the dimer of single-molecule magnets (Mn4)2 are studied by inelastic neutron scattering as a function of hydrostatic pressure. The anisotropy parameters D and B04, which describe each Mn4 subunit, are essentially pressure independent, while the antiferromagnetic exchange coupling J between the two Mn4 subunits strongly depends on pressure, with an increase of 42% at 17 kbar. Additional pressure dependent powder X-ray measurements allow a structural interpretation of the findings.