Observation of heavy spin-orbit excitons propagating in a nonmagnetic background: The case of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>Ba</mml:mi><mml:mo>,</mml:mo><mml:mi>Sr</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>YIrO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Kusch, Maximilian; Katukuri, Vamshi M.; Bogdanov, Nikolay A.; Büchner, B.; Dey, Tusharkanti; Efremov, D. V.; Hamann-Borrero, J. E.; Kim, B. H.; Krisch, M.; Maljuk, A.; Sala, M. Moretti; Wurmehl, S.; Aslan-Cansever, G.; Sturza, Mihai; Hozoi, Liviu; Brink, Jeroen van den; Geck, J.

doi:10.1103/physrevb.97.064421

Cited by 46 publications

(30 citation statements)

References 33 publications

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“…Assuming excitonic excitations, although questioned, partial reduction of Ir +5 to Ir 4+ continues to be an issue of concern. The quite consistent values published recently do not appear to be accidental; they rather should have a common origin.…”

Section: Figurementioning

confidence: 99%

On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆

Prasad¹,

Doert

Felser³

et al. 2018

Chemistry A European J

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Open-shell transition metal oxides are capable of developing a rich diversity of electronic phases. The specific features evolving crucially depend on an intricate interplay of various local and long-range electronic interactions. Recently, the 5d transition elements have come into sharp focus because for these elements spin-orbit coupling (SOC) and onsite Coulomb repulsion (U) are on a comparable energy scale. For Ir the t level associated to an octahedral crystal field (CF) is split by SOC, giving rise to a J = spin state and rendering respective oxides like Sr IrO as Mott insulators. Transferring this scenario to iridium(V) oxides would lead to a diamagnetic ground state, J =0. However, reported experimental results do not lend unambiguous support for such an electronic state. Theoretical explanations for the breakdown of the J=0 magnetic state suffer from conspicuous discrepancies. In an attempt to empirically contribute to resolving the puzzle, Bi NaIrO was synthesized in high purity by precipitation from homogeneous solution; it represents an iridium(V) oxide where long range band structure effects and magnetic superexchange are minimized, and the t degeneracy is lifted geometrically. We managed to reduce the strength of paramagnetic response, lending support to a J =0 ground state of Bi NaIrO , exhibiting van Vleck type behavior.

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Section: Figurementioning

confidence: 99%

On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆

Prasad¹,

Doert

Felser³

et al. 2018

Chemistry A European J

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show abstract

“…This has not only basic scientific interest but also undoubted practical potential in spintronics. Consequently, interest in 5d 4 magnetism has been boosted following this publication [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Magnetism of Ir5+ -based double perovskites: Unraveling its nature and the influence of structure

et al. 2020

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A combination of x-ray-diffraction, x-ray absorption, x-ray magnetic circular dichroism, macroscopic magnetization, and muon-spin relaxation measurements is used to investigate the interplay between structure (both crystallography and microstructure) and magnetism in Sr 2 YIrO 6 as a function of both chemical (Ca-doping) and physical (hydrostatic) pressure. X-ray absorption spectroscopy clearly shows that the physical pressure is more effective in modifying the structure. On the other hand, the dichroic measurements evidence a constant magnetic signal with physical pressure and strong differences with Ca-doping. Muon-spin relaxation reveals the presence of magnetic order, even when this is hidden in the magnetization data. From the combined analysis, the magnetic results are explained in terms of the presence of Ir 6+ or Ir 4+ ions in magnetic clusters, most likely located at and triggered by antisite disorder. The measurements under high physical pressure indicate that the magnetic state is independent of the crystallographic details such as Ir-O distances and Ir-O-Y angles.

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“…In that case, the multiplet structure of d 4 configuration is well described by the LS coupling scheme. This is indeed the assumption made in many of the earlier works, [14][15][16][17] for instance in 18 while deriving the t-J -like model of Sr 2 IrO 4 to calculate the PES spectra. The PES spectra, thus obtained, reproduces the low-energy features of the experimental spectra remarkably well, which is both interesting and intriguing.…”

Section: Introductionmentioning

confidence: 57%

Influence of the multiplet structure on the photoemission spectra of spin-orbit driven Mott insulators: Application to Sr2IrO4

Pärschke

Ray

2018

Phys. Rev. B

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Most of the low-energy effective descriptions of spin-orbit driven Mott insulators consider spinorbit coupling (SOC) as a second-order perturbation to electron-electron interactions. However, when SOC is comparable to anisotropic Hund's coupling, such as in Ir, the validity of this formally weak-SOC approach is not a priori known. Depending on the relative strength of SOC and anisotropic Hund's coupling, different descriptions of the multiplet structure should be employed in the weak and strong SOC limits, viz. LS and jj coupling schemes, respectively. We investigate the implications of both the coupling schemes on the low-energy effective t − J model and calculate the angle-resolved photoemission (ARPES) spectra using self-consistent Born approximation. In particular, we obtain the ARPES spectra of quasi-two-dimensional square-lattice Iridate Sr2IrO4 in both weak and strong SOC limits. The differences in the limiting cases are understood in terms of the composition and relative energy splittings of the multiplet structure. Our results indicate that the LS coupling scheme yields better agreement with the experiment, thus providing an indirect evidence for the validity of LS coupling scheme for iridates. We also discuss the implications for other metal ions with strong SOC.

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Observation of heavy spin-orbit excitons propagating in a nonmagnetic background: The case of (Ba,Sr)2YIrO6

Cited by 46 publications

References 33 publications

On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆

On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆

Magnetism of Ir5+ -based double perovskites: Unraveling its nature and the influence of structure

Influence of the multiplet structure on the photoemission spectra of spin-orbit driven Mott insulators: Application to Sr2IrO4

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Observation of heavy spin-orbit excitons propagating in a nonmagnetic background: The case of (Ba,Sr)2YIrO6

Cited by 46 publications

References 33 publications

On Jeff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi2NaIrO6

On Jeff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi2NaIrO6

Magnetism of Ir5+ -based double perovskites: Unraveling its nature and the influence of structure

Influence of the multiplet structure on the photoemission spectra of spin-orbit driven Mott insulators: Application to Sr2IrO4

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On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆

On J_eff=0 Ground State Iridates(V): Tracking Residual Paramagnetism in New Bi₂NaIrO₆