Abstract
The phase transition in the compound ${\mathrm{LiVGe}}_{2}{\mathrm{O}}_{6}$ has been proposed as a unique example of a spin-Peierls transition in an $S=1$ antiferromagnetic chain. We report neutron- and x-ray-diffraction measurements of ${\mathrm{LiVGe}}_{2}{\mathrm{O}}_{6}$ above and below the phase transition at $T=24 \mathrm{K}.$ No evidence is seen for any structural distortion associated with the transition. The neutron results indicate that the low-temperature state is antiferromagnetic, driven by ferromagnetic interchain couplings.
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