CaV2O4 is a spin-1 antiferromagnet, where the magnetic vanadium ions are arranged on quasi-one-dimensional (1D) zig-zag chains with potentially frustrated antiferromagnetic exchange interactions. High temperature susceptibility and single-crystal neutron diffraction measurements are used to deduce the non-collinear magnetic structure, dominant exchange interactions and orbital configurations. The results suggest that at high temperatures CaV2O4 behaves as a Haldane chain, but at low temperatures, orbital ordering lifts the frustration and it becomes a spin-1 ladder.
@article{arxiv.0812.1808,
title = {Magnetic Structure and Interactions in the Quasi-1D Antiferromagnet CaV$_2$O$_4$},
author = {Oliver Pieper and Bella Lake and Aziz Daoud-Aladine and Manfred Reehuis and Karel Prokes and Bastian Klemke and Klaus Kiefer and Jiaqiang Yan and Asad Niazi and David C. Johnston and Andreas Honecker},
journal= {arXiv preprint arXiv:0812.1808},
year = {2010}
}