Spin Model of O2-based Magnet in a Nanoporous Metal Complex

TL;DR

This study uses inelastic neutron scattering to identify and model the spin interactions in an O2-adsorbed nanoporous metal complex, revealing different magnetic behaviors at varying oxygen concentrations.

Contribution

It provides a detailed spin model for O2-based magnets in a nanoporous metal complex, distinguishing between dimer and trimer interactions at different oxygen loadings.

Findings

Magnetic excitations explained by spin dimers and trimers.

Quantitative agreement of magnetization curves with the model.

Identification of oxygen concentration-dependent spin states.

Abstract

Inelastic neutron scattering experiments are performed on a nanoporous metal complex Cu-Trans-1,4-Cyclohexanedicarboxylic Acid (Cu-CHD) adsorbing O2 molecules to identify the spin model of the O2-based magnet realized in the host complex. It is found that the magnetic excitations of Cu-CHDs adsorbing low- and high-concentration O2 molecules are explained by different spin models, the former by spin dimers and the latter by spin trimers. By using the obtained parameters and also by assuming that the levels of the higher energy states are reduced because of the non-negligible spin dependence of the molecular potential of oxygen, the magnetization curves are explained in quantitative level.