%0 Journal Article
%T Spectroscopic evidence for giant orbital moment and magnetic anisotropy induced by local distortions in alpha-CoV2O6
%A N. Hollmann
%A S. Agrestini
%A Z. Hu
%A Z. He
%A M. Schmidt
%A C. -Y. Kuo
%A M. Rotter
%A A. A. Nugroho
%A V. Sessi
%A A. Tanaka
%A N. B. Brookes
%A L. H. Tjeng
%J Physics
%D 2013
%I arXiv
%X We present a combined experimental and theoretical study on the local magnetism of the Co ions in the spin-chain compound CoV2O6, which crystallizes in two different allotropic phases, alpha- and gamma-CoV2O6. Using x-ray magnetic circular dichroism, we have found a very large and a moderate orbital contribution to the magnetism in alpha- and gamma-CoV2O6, respectively. Full-multiplet calculations indicate that the differences in the magnetic behavior of alpha- and gamma-CoV2O6 phases originate from different local distortions of the CoO6 octahedra. In particular, the strong compression of the CoO6 octahedra in alpha-CoV2O6 lead to a strong mixture of t2g and eg orbitals which, via the local atomic Coulomb and exchange interactions, results in an exceptionally large orbital moment.
%U http://arxiv.org/abs/1307.6690v1