Electronic and magnetic structures of a mixed triple perovskite: Ba3 NiRuIrO9

Kumar, S and Kargeti, K and Joshi, DC and Das, G and Patel, RK and Freeland, JW and Olivi, L and Aquilanti, G and Kaushik, SD and Mathieu, R and Panda, SK and Khalyavin, DD and Middey, S (2024) Electronic and magnetic structures of a mixed triple perovskite: Ba3 NiRuIrO9. In: Physical Review B, 110 (2).

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Abstract

In search of spin-orbit coupling driven nonmagnetic J=0 ground state and excitonic magnetism, various pentavalent iridates have been studied in recent years. However, a finite moment was observed in most of the cases due to solid state effects. In this work, we investigate the electronic and magnetic structure of 6H hexagonal compound Ba3NiRuIrO9, where Ir5+ is present along with magnetic Ni2+ and Ru5+ ions. Magnetic susceptibility measurements and neutron powder diffraction (NPD) experiments demonstrate the appearance of short-range magnetic ordering below 170 K and a long-range antiferromagnetic ordering below 80 K. The refinement of the NPD pattern further shows that the Ru and Ir moments interact antiferromagnetically within the dimer and interact ferromagnetically with the Ni sublattice. These experimental findings have been complemented by first-principles density functional theory calculations incorporating spin-orbit coupling effects and electronic correlations for the transitional metal d states. The computed magnetocrystalline anisotropy is also found to be significant and the crystallographic c axis comes out to be the easy axis of magnetization, consistent with the spin alignment direction found from NPD. This study shows that the mixed ruthenate iridate triple perovskite series is a promising family to study the interplay among spin-orbit coupling, electron correlation, and electron filling as a variety of Ba3MRuIrO9 with M as a transition metal ion, rare-earth ion, and alkali metal ions can be synthesized. © 2024 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to American Physical Society.
Keywords:	Antiferromagnetism; Density functional theory; Ground state; Magnetic susceptibility; Orbits; Perovskite; Rare earths; Transition metals, Antiferromagnetic orderings; Excitonics; Finite moments; Hexagonal compounds; Magnetic susceptibility measurements; Nonmagnetics; Short-range magnetic orders; Spin-orbit couplings; State effects; Triple perovskite, Metal ions
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	18 Dec 2024 05:06
Last Modified:	18 Dec 2024 05:06
URI:	http://eprints.iisc.ac.in/id/eprint/85837

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