Investigation of a ring single molecular magnet Mn$_6$R$_6$ in megagauss fields

TL;DR

This study investigates the magnetic susceptibility of a single molecular magnet Mn6R6 in megagauss fields, revealing quantum jumps and strong three-spin interactions that influence its magnetic properties.

Contribution

It provides the first experimental evidence of magnetic quantum jumps in Mn6R6 at high fields and demonstrates the significance of three-spin interactions in its magnetic behavior.

Findings

Detection of susceptibility spikes indicating quantum jumps

Identification of strong three-spin interactions

Determination of exchange constants in the molecular magnet

Abstract

The dependence of the magnetic susceptibility on the magnetic field is investigated for the single molecular magnet [Mn(hfac)$_2$NITPh]$_6$. The spikes of the susceptibility detected in a magnetic field ranging from 90 T to 285 T are interpreted as a manifestation of magnetic quantum jumps under spins reorientation from ferrimagnetic to ferromagnetic structure. The characteristic feature of the single molecular magnet Mn$_6$ R$_6$ is a deficiency of pair Heisenberg exchange interactions for the description of its magnetic properties in high magnetic fields. The comparison of the experimental data with the results of theoretical calculations allows us to prove the existence of strong three-spin interaction in this molecular cluster and to determine the values of exchange constants. For the calculation of the ground state spin structure the modified Lanczos method is used.