Novel Itinerant Antiferromagnet With Nonmagnetic Constituents*

While many systems exhibit both local and itinerant magnetism, only two are known to display magnetism while being composed of non-magnetic elements - Sc$_3$In and ZrZn$_2$. Drastic differences in dimensionality, critical scaling and susceptibility to perturbations suggest that more systems like this would be useful in identifying the origin of their magnetic properties. In this talk, the properties of a new itinerant antiferromagent with no magnetic constituents, are presented. Specific heat, resistivity and magnetization data indicate magnetic ordering below $T_N \approx$ 36 K. Above this temperature, the susceptibility displays Curie-Weiss-like behavior, with an unexpectedly large paramagnetic moment $\mu_{PM}\approx 0.8~\mu_B~F.U.^{-1}$. The magnetism is confirmed by band structure calculations, which suggest a spin-density wave ground state with a modulation wavevector $Q$ = $(0, 2\pi/3b, 0)$.