The antiferromagnetic molecular wheel Fe18 of eighteen exchange-coupled Fe(III) ions has been studied by measurements of the magnetic torque, the magnetization, and the inelastic neutron scattering spectra. The combined data show that the low-temperature magnetism of Fe18 is very accurately described by the Neel-vector tunneling (NVT) scenario, as unfolded by semiclassical theory. In addition, the magnetic torque as a function of applied field exhibits oscillations that reflect the oscillations in the NVT tunnel splitting with field due to quantum phase interference.
Cite
@article{arxiv.0902.4564,
title = {Quantum Phase Interference and Neel-Vector Tunneling in Antiferromagnetic Molecular Wheels},
author = {O. Waldmann and T. C. Stamatatos and G. Christou and H. U. Güdel and I. Sheikin and H. Mutka},
journal= {arXiv preprint arXiv:0902.4564},
year = {2015}
}