Magnetic Order in Honeycomb Layered U_2Pt_6Ga_15 Studied by Resonant X-ray and Neutron Scatterings
arxiv(2024)
摘要
Antiferromagnetic (AF) order of U_2Pt_6Ga_15 with the ordering
temperature T_ N = 26 K was investigated by resonant X-ray scattering
and neutron diffraction on single crystals. This compound possesses a unique
crystal structure in which uranium ions form honeycomb layers and then stacks
along the c-axis with slight offset, which gives rise to a stacking disorder.
The AF order can be described with the propagation vector of q = (1/6, 1/6,
0) in the hexagonal notation. The ordered magnetic moments orient
perpendicular to the honeycomb layers, indicating a collinear spin structure
consistent with Ising-like anisotropy. The magnetic reflections are found to be
broadened along c^* indicating that the stacking disorder results in
anisotropic correlation lengths. The semi-quantitative analysis of neutron
diffraction intensity, combined with group theory considerations based on the
crystallographic symmetry, suggests a zig-zag type magnetic structure for the
AF ground state, in which the AF coupling runs perpendicular to the stacking
offset, characterized as q = (1, 0, 0)_ orth. The realization of the
zig-zag magnetic structure implies the presence of frustrating intralayer
exchange interactions involving both ferromagnetic (FM) first-neighbor and AF
second and third-neighbor interactions in this compound.
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