Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not

Details Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not

2003-10-27

arxiv.org/abs/cond-mat/0310629v2

Phys. Rev. Lett. 92, 147201 (2004)

Physics

Condensed Matter

Materials Science

replaced (incorrect version submitted)

Scientific paper

10.1103/PhysRevLett.92.147201

Ni$_3$Al and Ni$_3$Ga are closely related materials on opposite sides of a ferromagnetic quantum critical point. The Stoner factor of Ni is virtually the same in both compounds and the density of states is larger in Ni$_3$Ga. So, according to the Stoner theory, it should be more magnetic, and, in LDA calculations, it is. However, experimentally, it is a paramagnet, while Ni$_3$Al is an itinerant ferromagnet. We show that the critical spin fluctuations are stronger than in Ni$_3$Ga, due to a weaker q-dependence of the susceptibility, and this effect is strong enough to reverse the trend. The approach combines LDA calculations with the Landau theory and the fluctuation-dissipation theorem using the same momentum cut-off for both materials. The calculations provide evidence for strong, beyond LDA, spin fluctuations associated with the critical point in both materials, but stronger in Ni$_3$Ga than in Ni$_3$Al.

Affiliated with

Also associated with

No associations

Rating

Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Why Ni$_3$Al is an itinerant ferromagnet but Ni$_3$Ga is not will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-374641