Spin--polarized electronic properties of NiHe0.25 under pressures

This paper studies the effects of He atom on the spin-polarized electronic properties of nickel under pressures using {\it ab initio} pseudopotential plan-wave method. Under high pressures, the compound of NiHe_0.25 can exist and helium-bubble can not create in Ni. A pressure-induced ferromagnetic to paramagnetic phase transition has been predicted in NiHe_0.25 at about 218 GPa. It is found that under pressures, the magnetic property of Ni atoms is more strongly affected by He atom than by H atom and that the behaviour of He atom in Ni are completely different from that of H atom, like the bonding characteristics and the electron transfer.