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arxiv 1307.6690 v1 pith:C376FGZH submitted 2013-07-25 cond-mat.str-el

Spectroscopic evidence for giant orbital moment and magnetic anisotropy induced by local distortions in alpha-CoV2O6

N. Hollmann , S. Agrestini , Z. Hu , Z. He , M. Schmidt , C.-Y. Kuo , M. Rotter , A. A. Nugroho
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V. Sessi A. Tanaka N. B. Brookes L. H. Tjeng
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classification cond-mat.str-el
keywords localalpha-gamma-cov2o6magneticorbitalalpha-cov2o6coo6different
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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.

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