title: Quantum phase interference and Néel-vector tunneling in antiferromagnetic molecular wheels.
abstract: The antiferromagnetic molecular wheel Fe18 of 18 exchange-coupled Fe;{III} 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.
authors.affiliation: Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany. oliver.waldmann@physik.uni-freiburg.de
authors.forename: O
authors.initials: O
authors.lastname: Waldmann
authors.forename: T C
authors.initials: TC
authors.lastname: Stamatatos
authors.forename: G
authors.initials: G
authors.lastname: Christou
authors.forename: H U
authors.initials: HU
authors.lastname: Güdel
authors.forename: I
authors.initials: I
authors.lastname: Sheikin
authors.forename: H
authors.initials: H
authors.lastname: Mutka