Orbital magnetism and spin-orbit effects in the electronic structure of BaIrO3

The electronic structure and magnetism of Ir 5d5 states in nonmetallic, weakly ferromagnetic BaIrO3 are probed with x-ray absorption techniques. Contrary to expectation, the Ir 5d orbital moment is found to be ~1.5 times larger than the spin moment. This unusual, atomiclike nature of the 5d moment i...

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Bibliographic Details
Published in:Physical review letters 2010-11, Vol.105 (21), p.216407-216407
Main Authors: Laguna-Marco, M A, Haskel, D, Souza-Neto, N, Lang, J C, Krishnamurthy, V V, Chikara, S, Cao, G, van Veenendaal, M
Format: Article
Language:English
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Summary:The electronic structure and magnetism of Ir 5d5 states in nonmetallic, weakly ferromagnetic BaIrO3 are probed with x-ray absorption techniques. Contrary to expectation, the Ir 5d orbital moment is found to be ~1.5 times larger than the spin moment. This unusual, atomiclike nature of the 5d moment is driven by a strong spin-orbit interaction in heavy Ir ions, as confirmed by the nonstatistical large branching ratio at Ir L(2,3) absorption edges. As a consequence, orbital interactions cannot be neglected when addressing the nature of magnetic ordering in BaIrO3. The local moment behavior persists even as the metallic-paramagnetic phase boundary is approached with Sr doping or applied pressure.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.105.216407