  New macroscopic quantum interference effects in the behavior of the
antiferromagnetic nanoclusters under action of a swept magnetic field are
predicted and theoretically investigated, namely : oscillations of the magnetic
susceptibility of nanocluster similar to the electron Bloch oscillations in
crystal and the corresponding Stark ladder-like resonances in ac-magnetic
field. These effects are related to that of the macroscopic quantum coherence
phenomena. The analogy of the antiferromagnetic nanoclusters quantum behavior
and Josephson junction with a small capacity was revealed as well.
