Collinear order in a frustrated three-dimensional spin-12 antiferromagnet Li2CuW2O8
Abstract
Magnetic frustration in three dimensions (3D) manifests itself in the spin-12 insulator Li2CuW2O8. Density-functional band-structure calculations reveal a peculiar spin lattice built of triangular planes with frustrated interplane couplings. The saturation field of 29 T contrasts with the susceptibility maximum at 8.5 K and a relatively low N\'eel temperature TN 3.9 K. Magnetic order below TN is collinear with the propagation vector (0,12,0) and an ordered moment of 0.65(4) μB according to neutron diffraction data. This reduced ordered moment together with the low maximum of the magnetic specific heat (C/R 0.35) pinpoint strong magnetic frustration in 3D. Collinear magnetic order suggests that quantum fluctuations play crucial role in this system, where a non-collinear spiral state would be stabilized classically.
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