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  Spin-orbit coupling and crystal-field distortions for a low-spin 3d5 state in BaCoO3

Chin, Y. Y., Hu, Z., Lin, H.-J., Agrestini, S., Weinen, J., Martin, C., et al. (2019). Spin-orbit coupling and crystal-field distortions for a low-spin 3d5 state in BaCoO3. Physical Review B, 100(20): 205139, pp. 1-11. doi:10.1103/PhysRevB.100.205139.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-5B62-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-9ED0-E
Genre: Journal Article

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 Creators:
Chin, Y. Y.1, Author
Hu, Z.1, Author
Lin, H.-J.1, Author
Agrestini, S.2, Author              
Weinen, J.3, Author              
Martin, C.1, Author
Hebert, S.1, Author
Maignan, A.1, Author
Tanaka, A.1, Author
Cezar, J. C.1, Author
Brookes, N. B.1, Author
Liao, Y.-F.1, Author
Tsuei, K.-D.1, Author
Chen, C. T.1, Author
Khomskii I, D.1, Author
Tjeng, L. H.4, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
4Liu 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 have studied the electronic structure of BaCoO3 using soft x-ray absorption spectroscopy at the Co L-2,L-3 and O K edges, magnetic circular dichroism at the Co L-2,L-3 edges, and valence band hard x-ray photoelectron spectroscopy. The quantitative analysis of the spectra established that the Co ions are in the formal low-spin tetravalent 3d(5) state and that the system is a negative charge transfer Mott insulator. The spin-orbit coupling also plays an important role for the magnetism of the system. At the same time, a trigonal crystal field is present with sufficient strength to bring the 3d(5) ion away from the J(eff )= 1/2 state. The sign of this crystal field is such that the a(1g) orbital is doubly occupied, explaining the absence of a Peierls transition in this system, which consists of chains of face-sharing CoO6 octahedra. Moreover, with one hole residing in e(g)(pi), the presence of an orbital moment and strong magnetocrystalline anisotropy can be understood. Yet we also infer that crystal fields with lower symmetry must be present to reproduce the measured orbital moment quantitatively, thereby suggesting the possibility for orbital ordering to occur in BaCoO3.

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Language(s): eng - English
 Dates: 2019-11-262019-11-26
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (20) Sequence Number: 205139 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008