Effect of Uniaxial Stress on the Curie Temperature in Fe₂P

Abstract

Shift of the Curie temperature T_c (\simeq195 K) of Fe₂P 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 dT_c⁄dp’s were: dT_c⁄dp_⁄⁄=7.8×10⁻³ deg/bar and dT_c⁄dp_⊥=−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.