Abstract of Publication No. 594
O. Waldmann, T. C. Stamatatos, G. Christou, H. U. Güdel, I. Sheikin and H. Mutka
The antiferromagnetic molecular wheel Fe18 of 18 exchange-coupled
FeIII ions has been studied by magnetic torque, magnetization,
and inelastic neutron scattering. The combined data show that the
low-temperature magnetism of Fe18 is very accurately described by the
Néel-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 splitting with field
due to quantum phase interference.