The role of nonmagnetic d0 vs. d10 B-type cations on the magnetic exchange interactions in osmium double perovskites

Feng, Hai L.; Yamaura, Kazunari; Tjeng, L. H.; Jansen, Martin

doi:10.1016/j.jssc.2016.08.022

Cited by 19 publications

(14 citation statements)

References 34 publications

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“…From the Curie-Weiss fit (green line) we extracted an effective magnetic moment µ ef f of 5.3 µ B and a Weiss-constant θ W of ∼ 125 K. The |θ W |/T N 1 ratio very close to 1 suggests that frustration of the exchange interactions is readily lifted in this compound, like in SrLaNiIrO 6 where |θ W |/T N 1 ratio is ∼1.2. A very different situation is observed in Ba 2 BOsO 6 (B = Sc, Y, In ) and SrLaCuIrO 6 , where |θ W |/T N 1 ratios of ∼ 6-8 indicate the presence of a large degree of frustration 56,57 .…”

Section: Discussionmentioning

confidence: 91%

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

et al. 2019

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We report on our investigation on the magnetism of the iridate double perovskite Sr2CoIrO6, a nominally Ir 5+ Van Vleck J ef f = 0 system. Using x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectroscopy at the Ir-L2,3 edges, we found a nearly zero orbital contribution to the magnetic moment and thus an apparent breakdown of the J ef f = 0 ground state. By carrying out also XAS and XMCD experiments at the Co-L2,3 edges and by performing detailed full atomic multiplet calculations to simulate all spectra, we discovered that the compound consists of about 90% Ir 5+ (J ef f = 0) and Co 3+ (S = 2) and 10% Ir 6+ (S = 3/2) and Co 2+ (S = 3/2). The magnetic signal of this minority Ir 6+ component is almost equally strong as that of the main Ir 5+ component. We infer that there is a competition between the Ir 5+ -Co 3+ and the Ir 6+ -Co 2+ configurations in this stoichiometric compound.

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Section: Discussionmentioning

confidence: 91%

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

et al. 2019

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“…However, 5d electrons are less correlated and more delocalized than 3d electrons; hence, their magnetic interactions through long-range paths still can be strong. Therefore, long-range Ir 6+ –O–O–Ir 6+ interactions are expected to be strong AFM as in the isoelectronic Os 5+ DPs Ba 2 BOs 5+ O 6 (B = Sc, Y) with large negative θ W values of −590 and −570 K, respectively. , Further, Ir has a much larger CF splitting energy than Ni, which would hinder hopping between the Ni e g and Ir e g orbitals because of poor energy overlap, weakening the FM Ni 2+ –O–Ir 6+ interactions. Thus, the magnetic properties of Ba 2 NiIrO 6 are believed to be determined by NN FM Ni 2+ –O–Ir 6+ interactions competing with long-range AFM Ir 6+ –Ir 6+ interactions; an AFM order is established regardless of the fact that FM interactions are dominant.…”

Section: Resultsmentioning

confidence: 99%

High-Pressure Synthesis of Double Perovskite Ba₂NiIrO₆: In Search of a Ferromagnetic Insulator

et al. 2020

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Double perovskite oxides with d8–d3 electronic configurations are expected to be ferromagnetic from the Goodenough–Kanamori rules, such as ferromagnetic La2NiMnO6. In search of new ferromagnetic insulators, double perovskite Ba2NiIrO6 was successfully synthesized by high-pressure and high-temperature methods (8 GPa and 1573 K). Ba2NiIrO6 crystallizes in a cubic double perovskite structure (space group: Fm3̅m), with an ordered arrangement of NiO6 and IrO6 octahedra. X-ray absorption near-edge spectroscopy confirms the nominal Ni(II) and Ir(VI) valence states. Ba2NiIrO6 displays an antiferromagnetic order at 51 K. The positive Weiss temperature, however, indicates that ferromagnetic interactions are dominant. Isothermal magnetization curves at low temperatures support a field-induced spin–flop transition.

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“…Recent results on Sr 2 B OsO 6 double perovskites ( B = Sc, Y, In) have highlighted the role of closed-shell (d 10 ) versus open-shell (d 0 ) configurations of the nonmagnetic cations in determining the magnetic exchange interactions. The magnetic exchange interaction were stronger in the case of d 0 systems. , Taking this into account, it would be interesting to synthesize and study an arsenate analogue of averievite. With a d 10 As 5+ anion, the coupling between OCu 4 layers should be decreased in strength, leading to more two-dimensional magnetic properties.…”

Section: Discussionmentioning

confidence: 99%

(CsX)Cu₅O₂(PO₄)₂ (X = Cl, Br, I): A Family of Cu²⁺ S = ¹/₂ Compounds with Capped-Kagomé Networks Composed of OCu₄ Units

et al. 2019

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Three new salt inclusion compounds (CsX)Cu5O2(PO4)2 (X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu4 anion-centered tetrahedra, forming capped-kagomé planes, which can also be regarded as two-dimensional slices along the [111] direction of a pyrochlore lattice. Magnetization and heat capacity measurements reveal strong geometric frustration of this network and complex magnetic behavior. X-ray and neutron diffraction studies show that all three compounds undergo a trigonal-to-monoclinic phase transition upon cooling, with a first-order phase transition seen in CsBr and CsI analogues. Along with the previously reported (CsCl)Cu5O2(VO4)2, these three new compounds belong to a large family of OCu4-based networks, which are a playground for studying frustrated quantum magnetism.

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The role of nonmagnetic d0 vs. d10 B-type cations on the magnetic exchange interactions in osmium double perovskites

Cited by 19 publications

References 34 publications

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

High-Pressure Synthesis of Double Perovskite Ba₂NiIrO₆: In Search of a Ferromagnetic Insulator

(CsX)Cu₅O₂(PO₄)₂ (X = Cl, Br, I): A Family of Cu²⁺ S = ¹/₂ Compounds with Capped-Kagomé Networks Composed of OCu₄ Units

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The role of nonmagnetic d0 vs. d10 B-type cations on the magnetic exchange interactions in osmium double perovskites

Cited by 19 publications

References 34 publications

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

High-Pressure Synthesis of Double Perovskite Ba2NiIrO6: In Search of a Ferromagnetic Insulator

(CsX)Cu5O2(PO4)2 (X = Cl, Br, I): A Family of Cu2+ S = 1/2 Compounds with Capped-Kagomé Networks Composed of OCu4 Units

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Product

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High-Pressure Synthesis of Double Perovskite Ba₂NiIrO₆: In Search of a Ferromagnetic Insulator

(CsX)Cu₅O₂(PO₄)₂ (X = Cl, Br, I): A Family of Cu²⁺ S = ¹/₂ Compounds with Capped-Kagomé Networks Composed of OCu₄ Units