Using synchrotron X-rays and neutron diffraction we disentangle spin-lattice order in highly frustrated ZnCr2O4 where magnetic chromium ions occupy the vertices of regular tetrahedra. Upon cooling below 12.5 K the quandary of anti-aligning spins surrounding the triangular faces of tetrahedra is resolved by establishing weak interactions on each triangle through an intricate lattice distortion. The resulting spin order is however, not simply a N\'{e}el state on strong bonds. A complex co-planar spin structure indicates that antisymmetric and/or further neighbor exchange interactions also play a role as ZnCr2O4 resolves conflicting magnetic interactions.
@article{arxiv.0905.2127,
title = {Spin-lattice order in frustrated ZnCr2O4},
author = {S. Ji and S. -H. Lee and C. Broholm and T. Y. Koo and W. Ratcliff and S-W. Cheong and P. Zschack},
journal= {arXiv preprint arXiv:0905.2127},
year = {2009}
}