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  Spectroscopic evidence for exceptionally high orbital moment induced by local distortions in α-CoV2O6

Hollmann, N., Agrestini, S., Hu, Z., He, Z., Schmidt, M., Kuo, C.-Y., et al. (2014). Spectroscopic evidence for exceptionally high orbital moment induced by local distortions in α-CoV2O6. Physical Review B, 89(20): 201101, pp. 1-6. doi:10.1103/PhysRevB.89.201101.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-BA0C-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-71C6-F
Genre: Journal Article

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 Creators:
Hollmann, N.1, Author              
Agrestini, S.2, Author              
Hu, Z.3, Author              
He, Z.4, Author
Schmidt, M.5, Author              
Kuo, C.-Y.6, Author              
Rotter, M.7, Author              
Nugroho, A. A.4, Author
Sessi, V.4, Author
Tanaka, A.4, Author
Brookes, N. B.4, Author
Tjeng, L. H.8, Author              
Affiliations:
1Nils Hollmann, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863456              
2Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
4external, ou_persistent22              
5Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
6Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
7Martin Rotter, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863453              
8Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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 Abstract: 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, α- and γ-CoV2O6. Using x-ray magnetic circular dichroism, we have found an exceptionally high and a moderate orbital contribution to the magnetism in α-CoV2O6 and γ-CoV2O6, respectively. Full-multiplet calculations indicate that the differences in the magnetic behavior of α- and γ-CoV2O6 phases originate from different local distortions of the CoO6 octahedra. In particular, the strong compression of the CoO6 octahedra together with the unusually small octahedral crystal field splitting in α-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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 Dates: 2014-05-02
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevB.89.201101
 Degree: -

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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 89 (20) Sequence Number: 201101 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008