Influence of the Dzyaloshinskii-Moriya exchange interaction on quantum   phase interference of spins
  Magnetization measurements of a Mn12mda wheel single-molecule magnet with a spin ground state of S = 7 show resonant tunneling and quantum phase interference, which are established by studying the tunnel rates as a function of a transverse field applied along the hard magnetization axis. Dzyaloshinskii-Moriya (DM) exchange interaction allows the tunneling between different spin multiplets. It is shown that the quantum phase interference of these transitions is strongly dependent on the direction of the DM vector. 
W. Wernsdorfer, T.C. Stamatatos, and G. Christou