Zur Kenntnis von Ba4Ir3O10

Wilkens, Jan J.; Müller‐Buschbaum, Hk.

doi:10.1002/zaac.19915920109

Cited by 21 publications

(5 citation statements)

References 19 publications

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“…Indeed, with one possible exception of the newly synthesized H3LiIr2O6 [13,14], no other iridates with exchange energies of hundreds of Kelvin have been found to be paramagnetically quantum-fluctuating down through sub-Kelvin temperatures [1,3], until now. Ba4Ir3O10 adopts a monoclinic structure with a P21/c space group, consistent with some previous structural data [15] (but not all [16]) (See Supplemental Materials (SM) [17] for details). The crystal structure consists of Ir3O12 trimers of face-sharing IrO6 octahedra that are vertex-linked to other trimers, forming wavelike 2D sheets in the bc plane that are stacked along the a axis with no connectivity between the sheets (Figs.…”

supporting

confidence: 88%

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

et al. 2020

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Quantum spin systems such as magnetic insulators usually show magnetic order, but such classical states can give way to quantum liquids with exotic entanglement through two known mechanisms of frustration: geometric frustration in lattices with triangle motifs, and spin-orbit-coupling frustration in the exactly solvable quantum liquid of Kitaev’s honeycomb lattice. Here we present the experimental observation of a new kind of frustrated quantum liquid arising in an unlikely place: the magnetic insulator Ba4Ir3O10 where Ir3O12 trimers form an unfrustrated square lattice. The crystal structure shows no apparent spin chains. Experimentally we find a quantum liquid state persisting down to 0.2 K that is stabilized by strong antiferromagnetic interaction with Curie–Weiss temperature ranging from −766 to −169 K due to magnetic anisotropy. The anisotropy-averaged frustration parameter is 2000, seldom seen in iridates. Heat capacity and thermal conductivity are both linear at low temperatures, a familiar feature in metals but here in an insulator pointing to an exotic quantum liquid state; a mere 2% Sr substitution for Ba produces long-range order at 130 K and destroys the linear-T features. Although the Ir4+(5d5) ions in Ba4Ir3O10 appear to form Ir3O12 trimers of face-sharing IrO6 octahedra, we propose that intra-trimer exchange is reduced and the lattice recombines into an array of coupled 1D chains with additional spins. An extreme limit of decoupled 1D chains can explain most but not all of the striking experimental observations, indicating that the inter-chain coupling plays an important role in the frustration mechanism leading to this quantum liquid.

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confidence: 88%

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

et al. 2020

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“…Three vertices each at the base of the adjacent Ir 3 O 12 trimers are connected by Nb(Ir)O 6 octahedra in a corner-sharing fashion resulting in a three-dimensional structure. The Ir–O bond lengths range between 2.01 and 2.035 Å, which matches well with the other known tetravalent iridium-based perovskites. − The present stoichiometry leads to the presence of three possible valence states of Ir, namely, Ir 5+ , Ir 4+ , and Ir 3+ . Although it is difficult to precisely assign a definite valence state to each of the Ir at three different sites, the bond valence sum (BVS) method proved useful .…”

Section: Resultssupporting

confidence: 83%

Crystal Growth of Spin-frustrated Ba₄Nb_0.8Ir_3.2O₁₂: A Possible Spin Liquid Material

Thakur

Chattopadhyay

Doert

et al. 2020

Crystal Growth & Design

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Polycrystalline Ba 4 NbIr 3 O 12 has recently been shown to be a promising spin liquid candidate. We report an easy and reliable method to grow millimeter-sized single crystals of this trimer-based spin liquid candidate material with the actual stoichiometry of Ba 4 Nb 0.8 Ir 3.2 O 12 . The growth of large crystals is achieved using BaCl 2 as flux. The crystals show a hexagonal platelike habit with edges up to 3 mm in length. The structure is confirmed by single-crystal X-ray diffraction and is found to be the same as that of the previously reported phase Ba 12 Nb 2.4 Ir 9.6 O 36 [Ba 4 Nb 0.8 Ir 3.2 O 12 ], indeed with a mixed occupancy of Nb/Ir at the 3a site. The magnetic and calorimetric study on the individual single crystals confirms the possibility of a spin liquid state consistent with a recent report on a polycrystalline sample.

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“…Assuming that the magnetic moments are carried by Ir 4+ ions with J eff =1/2 moment [18,44] and an acceptable difference between S and N, we approximate the structure with the room temperature space group P2 1 /a [17,33]. An irreducible representation analysis [45] with a propagation vector k = (0 0 0.5) on space group P2 1 /a, however, fails to reproduce the momentum and intensity pattern of the magnetic peaks.…”

Section: Discussionmentioning

confidence: 99%

“…Select Ba4310 crystals were crushed and characterized via powder x-ray diffraction. Fig 1(d) displays the PXRD data collected at T = 300K, which falls into the P2 1 /a space group (SG) (lattice parameters, a=5.784 Å , b=13.226 Å , c=7.239 Å and β=112.935 • at 300K) [33].…”

Section: Crystal Structurementioning

confidence: 99%

Structural and magnetic transitions in the planar antiferromagnet Ba4Ir3O10

Chen

et al. 2021

Phys. Rev. B

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We report the structural and magnetic ground state properties of the monoclinic compound barium iridium oxide Ba4Ir3O10 using a combination of resonant x-ray scattering, magnetometry, and thermodynamic techniques. Magnetic susceptibility exhibits a pronounced antiferromagnetic transition at TN ≈ 25K, a weaker anomaly at TS ≈ 142K, and strong magnetic anisotropy at all temperatures. Resonant elastic x-ray scattering experiments reveal a second order structural phase transition at TS and a magnetic transition at TN. Both structural and magnetic superlattice peaks are observed at L = half integer values. The magnetization anomaly at TS implies the presence of magneto-elastic coupling, which conceivably facilitates the symmetry lowering. Mean field critical scattering is observed above TS. The magnetic structure of the antiferromagnetic ground state is discussed based on the measured magnetic superlattice peak intensity. Our study not only presents essential information for understanding the intertwined structural and magnetic properties in Ba4Ir3O10, but also highlights the necessary ingredients for exploring novel ground states with octahedra trimers.

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Zur Kenntnis von Ba₄Ir₃O₁₀

Cited by 21 publications

References 19 publications

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

Crystal Growth of Spin-frustrated Ba₄Nb_0.8Ir_3.2O₁₂: A Possible Spin Liquid Material

Structural and magnetic transitions in the planar antiferromagnet Ba4Ir3O10

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Zur Kenntnis von Ba4Ir3O10

Cited by 21 publications

References 19 publications

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10

Crystal Growth of Spin-frustrated Ba4Nb0.8Ir3.2O12: A Possible Spin Liquid Material

Structural and magnetic transitions in the planar antiferromagnet Ba4Ir3O10

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Zur Kenntnis von Ba₄Ir₃O₁₀

Crystal Growth of Spin-frustrated Ba₄Nb_0.8Ir_3.2O₁₂: A Possible Spin Liquid Material