"Hall effect" for neutrons scattered by an A phase MnSi crystal
  We study a neutron diffraction by A phase of MnSi using a dynamical theory of diffraction and three wave approximation. We show that the neutron diffraction is asymmetrical with respect to an incident plane. The asymmetry depends on a sign of an external magnetic field. This phenomenon can be considered as the Hall effect for neutrons. 
O.G. Udalov, A.A. Fraerman
cond-mat.str-el