Volume Magnetostriction in Itinerant Electron Ferromagnetic Ni₃Al System

Abstract

The volume magnetostriction and magnetization in the itinerant electron ferromagnetic Ni 3 Al system have been measured. The magneto-elastic coupling constant D ( T ) at temperature T shows a T 4/3 -dependence in a temperature range below T c . D ( T ) is calculated by using the self-consistent renormalization (SCR) theory of spin fluctuations, which explains experimental results well. The shift of the Curie temperature T c with pressure P , d T c /d P is calculated in the same way. The estimated value of d T c /d P by employing the present experimental results or magnetization and volume magnetostriction agrees very well with the experimental one by Buis et al. The T c -dependence of d T c /d P is also discussed by using the present calculated result.