MAGNETIC EFFECTS IN TRANSVERSE ELASTIC-CONSTANTS OF BCC FE(SI)

We report measurements of the transverse elastic constants C' = (C-11 - C-12)/2 and C-44 of Fe(Si) single crystals from room temperature to T/T-C congruent to 1.2 obtained from ultrasonic velocities determined by a pulse superposition method. Results are interpreted assuming that the elastic constants are the sum of an intrinsic magnetic contributi on, proportional to the near-neighbour magnetic correlation function, and a 'non-magnetic' contribution (including indirect magnetostrictive contributions), approximated by a function of the lattice parameter o nly.