title: Asymmetric Berry-phase interference patterns in a single-molecule magnet.
abstract: A Mn(4) single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field (H(T)) dependence of the magnetization tunneling probability when a longitudinal field (H(L)) is present, contrary to symmetric patterns observed for H(L)=0. Reversal of H(L) results in a reflection of the transverse-field asymmetry about H(T)=0, as expected on the basis of the time-reversal invariance of the spin-orbit Hamiltonian which is responsible for the tunneling oscillations. A fascinating motion of Berry-phase minima within the transverse-field magnitude-direction phase space results from a competition between noncollinear magnetoanisotropy tensors at the two distinct Mn sites.
authors.affiliation: Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
authors.forename: H M
authors.initials: HM
authors.lastname: Quddusi
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Singh
authors.forename: K J
authors.initials: KJ
authors.lastname: Heroux
authors.forename: E
authors.initials: E
authors.lastname: del Barco
authors.forename: S
authors.initials: S
authors.lastname: Hill
authors.forename: D N
authors.initials: DN
authors.lastname: Hendrickson