Pressure Effects on the Curie Temperature of (Co_1−xMn_x)₂P

Abstract

Measurement of the Curie temperature was made on the (Co_1−xMn_x)₂P, 0.3≤x≤0.7, compounds by the ac susceptibility under pressure up to 60 kbar. The Curie temperature T_c of each concentration increased with increasing pressure and was represented by a function of pressure, P, as T_c=T_c⁰+αP+βP². The constants T_c⁰ (T_c at P=0), α and β took maxima in the vicinity of x=0.5. The results obtained are analyzed on the basis of the pair interaction model, and it was suggested that the interatomic-distance dependence of the exchange interaction energy between the Mn atoms oscillates.