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We have used neutron diffraction measurements to study the zero-fieldmagnetic structure of the intermetallic compound Yb3Pt4, which was earlierfound to order antiferromagnetically at the Neel temperature TN=2.4 K, anddisplays a field-driven quantum critical point at 1.6 T. In Yb3Pt4, the Ybmoments sit on a single low-symmetry site in the rhombohedral lattice withspace group R-3. The Yb ions form octahedra with edges that are twisted withrespect to the hexagonal unit cell, a twisting that results in every Yb ionhaving exactly one Yb nearest neighbor. Below TN, we found new diffractedintensity due to a k=0 magnetic structure. This magnetic structure was comparedto all symmetry-allowed magnetic structures, and was subsequently refined. Thebest fitting magnetic structure model is antiferromagnetic, and involves pairsof Yb nearest neighbors on which the moments point almost exactly towards eachother. This structure has moment components within the ab-plane as well asparallel to the c-axis, although the easy magnetization direction lies in theab-plane. Our magnetization results suggest that besides the crystal-electricfield anisotropy, anisotropic exchange favoring alignment along the c-axis isresponsible for the overall direction of the ordered moments. The magnitude ofthe ordered Yb moments in Yb3Pt4 is 0.81 uB/Yb at 1.4 K. The analysis of thebulk properties, the size of the ordered moment, and the observation ofwell-defined crystal-field levels argue that the Yb moments are spatiallylocalized in zero field.

Determination of the magnetic structure of Yb3Pt4: a k=0 local-moment antiferromagnet