title: Orbital magnetism and spin-orbit effects in the electronic structure of BaIrO3.
abstract: 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.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. laguna@icmm.csic.es
authors.forename: M A
authors.initials: MA
authors.lastname: Laguna-Marco
authors.forename: D
authors.initials: D
authors.lastname: Haskel
authors.forename: N
authors.initials: N
authors.lastname: Souza-Neto
authors.forename: J C
authors.initials: JC
authors.lastname: Lang
authors.forename: V V
authors.initials: VV
authors.lastname: Krishnamurthy
authors.forename: S
authors.initials: S
authors.lastname: Chikara
authors.forename: G
authors.initials: G
authors.lastname: Cao
authors.forename: M
authors.initials: M
authors.lastname: van Veenendaal