Trimer-based spin liquid candidate 
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Nguyen, Loi T.; Cava, R. J.

doi:10.1103/physrevmaterials.3.014412

Cited by 21 publications

(34 citation statements)

References 30 publications

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“…First, previous studies [25] have shown that no magnetic ordering occurs in Ba 5 CuIr 3 O 12 down to 4 K despite a Curie temperature of −98 K, which suggests a possible QSL ground state. Moreover, a related compound Ba 4 NbIr 3 O 12 has recently been proposed to be a QSL candidate material [27]. Second, the nature of the Ir magnetic moments in this system is quite peculiar.…”

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confidence: 99%

“…The 5d Ir ions have a strong spin-orbit coupling and form face-sharing Ir 4+ trimers, which renders the usual local J eff =1/2 moment picture [28,29] inapplicable due to enhanced covalency. Instead, molecular orbitals at each Ir trimer are expected to form [24,27,30]. Finally, the material contains intrinsic disorder due to site mixing between Cu and Ir, as well as Cu displacement from the prism center [25,26] [see Fig.…”

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Random singlet state in Ba5CuIr3O12 single crystals

et al. 2020

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We study the thermodynamic and high-magnetic-field properties of the magnetic insulator Ba5CuIr3O12, which shows no magnetic order down to 2 K consistent with a spin liquid ground state. While the temperature dependence of the magnetic susceptibility and the specific heat shows only weak antiferromagnetic correlations, we find that the magnetization does not saturate up to a field of 59 Tesla, leading to an apparent contradiction. We demonstrate that the paradox can be resolved, and all of the experimental data can be consistently described within the framework of random singlet states. We demonstrate a generic procedure to derive the exchange coupling distribution P (J) from the magnetization measurements and use it to show that the experimental data is consistent with the power-law form P (J) ∼ J −α with α ≈ 0.6. Thus, we reveal that high-magnetic-field measurements can be essential to discern quantum spin liquid candidates from disorder dominated states that do not exhibit long-range order.Strong quantum fluctuations in insulating magnetic compounds can give rise to quantum spin liquid (QSL) ground states, where the interaction-driven ordering tendencies are thwarted completely. Devoid of long-range order, QSLs lie beyond the Landau symmetry-based classification, and are characterized instead by their unconventional entanglement properties and the presence of exotic fractionalized excitations [1,2]. However, identifying the elusive QSL behavior in real materials has proven to be a formidable task [2][3][4]. The search for QSL candidate materials represents a major challenge of modern condensed matter physics.Disorder is one of the major hindrances to identify QSL materials [5][6][7], as it can drive the formation of random singlet states (RSS) [8] or disordered stripe states [9] instead of a QSL. Importantly, this includes single-crystal samples due to intrinsic disorder [10,11]. A convenient reference point can be found in one-dimensional (1D) systems, where the quantum fluctuations are dominant [12] and the effect of disorder was clarified some time ago [13,14]. In 1D it converts the spin liquid ground state into a RSS, where the effective exchange coupling follows a broad probability distribution that has a universal form [15] at low energies. In 2D and 3D, on the contrary, the fate of disordered spin systems is still an open question. While a random singlet state with a power-law distribution has been conjectured [16], the true ground state of such systems is still under debate and might not be universal [17][18][19]. In particular, enhanced suppression of QSL states by disorder has been found in model calculations [19,20]. However, mechanisms for the stabilization of QSL states by disorder have also been proposed [21]. Additionally, a strong spin-orbit coupling (SOC) is an important ingredient in many QSL candidates. While its effects on clean QSLs have been studied [1, 2] and particularly emphasized for the so-called Kitaev materials [22,23], the interplay of SOC with disorder still remains to be underst...

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Random singlet state in Ba5CuIr3O12 single crystals

et al. 2020

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“…Recently, unconventional electronic and magnetic ground states have been reported in compounds with the basic units of Ir-trimers, i.e. three face-sharing IrO 6 octahedra, which are much less explored so far [15][16][17]. For instance, both charge density wave and canted antiferromagnetic order have been observed in the quasione-dimensional compound BaIrO 3 [15,[18][19][20].…”

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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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“…Sr 2 CaReO 6 , and Ba 4 NbIr 3 O 12 -illustrating such a scenario have been reported, so far. [6][7][8][9][10][11] In this work, we report the synthesis, structure, and magnetic properties of an ordered double perovskite Sr 2 NaOsO 6 . Though this compound was first synthesized by Sleight et al in 1962, its structure and magnetic properties were not reported.…”

Section: Introductionmentioning

confidence: 99%

“…[ 5 ] Discovering materials with magnetic frustrated states such as spin liquid and spin glass in perovskites are of particular interest to the solid matter chemistry and physics communities, however, unfortunately only very few examples – Sr 2 FeMO 6 (Nb, Mo, Te), Sr 2 CaReO 6 , and Ba 4 NbIr 3 O 12 ‐ illustrating such a scenario have been reported, so far. [ 6–11 ]…”

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confidence: 99%

Structure and Magnetic Properties of Sr₂NaOsO₆

2020

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Sr2NaOsO6, an ordered double perovskite, was obtained by solid‐state synthesis. The compound crystallizes in a monoclinic cell [P21/n, a = 5.7043(1) Å, b = 5.7828(1) Å, c = 8.0816(2) Å; β = 90.01(2)°] and develops long‐range antiferromagnetic order at ≈ 17 K with strong canting generating a tiny spontaneous moment of 0.06 µB/Os ion. A fit of the high temperature susceptibility data according to a modified Curie–Weiss law revealed a small effective paramagnetic moment of 0.7 µB/Os, which underlines the substantial effect of spin‐orbit coupling in 5d oxides. A broad instead of a sharp lambda anomaly in specific heat data suggests frustration and strong magnetic disorder at the osmium lattice.

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Trimer-based spin liquid candidate Ba4NbIr3O12

Cited by 21 publications

References 30 publications

Random singlet state in Ba5CuIr3O12 single crystals

Random singlet state in Ba5CuIr3O12 single crystals

Structural and magnetic transitions in the planar antiferromagnet Ba4Ir3O10

Structure and Magnetic Properties of Sr₂NaOsO₆

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Trimer-based spin liquid candidate Ba4NbIr3O12

Cited by 21 publications

References 30 publications

Random singlet state in Ba5CuIr3O12 single crystals

Random singlet state in Ba5CuIr3O12 single crystals

Structural and magnetic transitions in the planar antiferromagnet Ba4Ir3O10

Structure and Magnetic Properties of Sr2NaOsO6

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Structure and Magnetic Properties of Sr₂NaOsO₆