Effect of Uniaxial Stress on the Curie Temperature in Fe2P

Abstract

Shift of the Curie temperature T c (≃195 K) of Fe 2 P single crystal has been measured in the presence of uniaxial stress. The stresses up to 80 bar were applied along the directions parallel and perpendicular to the c -axis ( c // and c ⊥ ). The T c 's increased and decreased with increasing stress in the cases of c // and c ⊥ , respectively and the average values of d T c /d p 's were: d T c /d p // =7.8×10 -3 deg/bar and d T c /d p ⊥ =-6.4×10 -3 deg/bar. The effect of stress on the exchange interactions between Fe atoms is discussed in connection with the pressure-induced magnetic transition previously found under hydrostatic high pressures.