Low-temperature crystal and magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mi>RuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Cao, Huibo; Banerjee, Arnab; Yan, Jiaqiang; Bridges, Craig A.; Lumsden, M. D.; Mandrus, David; Tennant, A.; Chakoumakos, Bryan C.; Nagler, S. E.

doi:10.1103/physrevb.93.134423

Cited by 363 publications

(436 citation statements)

References 42 publications

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“…The dip of T N at 0.5 GPa is attributed an intermediate stacking, and/or stacking fault in the middle. In fact, it was reported that α-RuCl 3 is subject to the ABC-to-AB stacking rearrangement under mechanical pressure 24 .…”

Section: Discussionmentioning

confidence: 99%

“…Interplay of spin-orbital couplings, Hubbard interactions, and Hund's coupling gives rise to an effective spin-1/2 quantum compass model [15][16][17][18][19][20] . Although zigzag type magnetic ordering was found at low temperatures in these systems because of the existence of non-Kitaev terms [21][22][23][24] , proximate Kitaev spin liquid behaviors are manifested by fermionic and continuum-like excitations observed in inelastic neutron and Raman scatterings 10,[25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

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High-pressure magnetization and NMR studies of α−RuCl3

et al. 2017

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We report high-pressure magnetization and 35 Cl NMR studies on α-RuCl3 with pressure up to 1.5 GPa. At low pressures, the magnetic ordering is identified by both the magnetization data and the NMR data, where the TN shows a concave shape dependence with pressure. These data suggest stacking rearrangement along the c-axis. With increasing pressure, phase separation appears prominently at P ≥ 0.45 GPa, and the magnetic volume fraction is completely suppressed at P ≥ 1.05 GPa. Meanwhile, a phase-transition-like behavior emerges at high pressures in the remaining volume by a sharp drop of magnetization M (T ) upon cooling, with the transition temperature Tx increased to 250 K at 1 GPa. The 1/ 35 T1 is reduced by over three orders of magnitude when cooled below 100 K. This characterizes a high-pressure, low-temperature phase with nearly absent static susceptibility and low-energy spin fluctuations. The nature of the high-pressure ground state is discussed, where a magnetically disordered state is proposed as a candidate state.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-pressure magnetization and NMR studies of α−RuCl3

et al. 2017

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“…The states with order parameter pointing along [111] directions in the rotated reference frame correspond to non-collinear states in the unrotated reference frame. Since recent experiments by Cao et al 22 have established that spins point along a cubic axis, by calculating the fluctuational corrections as a function of Γ, we can find an upper bound on its value, such that the Kitaev fluctuations dominate and keep the cubic axes as the preferred directions. From our calculations it follows that for J 1 = −2.9 meV and K 1 = 8.1 meV the upper bound for Γ is about 0.8 meV.…”

Section: The Role Of Off-diagonal Symmetric γ-Termmentioning

confidence: 99%

“…18,20-22 Recent X-ray and neutron scattering diffraction data 21,22 indicate that the best fit to the collinear structure is obtained for the antiferromagnetic nearest neighbor Kitaev interaction and when the spin direction points 35…”

Section: -15mentioning

confidence: 99%

Selection of direction of the ordered moments inNa2IrO3andα−RuCl3

2016

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The magnetic orders in Na2IrO3 and α−RuCl3, honeycomb systems with strong spin-orbit coupling and correlations, have been recently described by models with the dominant Kitaev interactions. In this work we discuss how the orientation of the magnetic order parameter is selected in this class of models. We show that while the order-by-disorder mechanism in the models with solely Kitaev anisotropies always select cubic axes as easy axes for magnetic ordering, the additional effect of other small bond-dependent anisotropies, such as, e.g., Γ-terms, lead to a deviation of the order parameter from the cubic directions. We show that both the zigzag ground state and the face-diagonal orientation of the magnetic moments in Na2IrO3 can be obtained within the J1 − K1 − J2 − K2 − J3 model in the presence of perturbatively small Γ-terms. We also show that the zigzag phase found in the nearest neighbor Kitaev-Heisenberg model, relevant for α−RuCl3, has some stability against the Γ-term.

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“…While α-RuCl 3 displays magnetic long-range order (LRO) of a so-called zigzag type, it has been proposed to be proximate to the Kitaev spin liquid based on its small ordering temperature and its unusual magnetic excitation spectrum [16][17][18]. The magnetic interactions between the Ru 3+ magnetic moments are believed to be described by a variant of the Heisenberg-Kitaev model [10]: Electronic-structure calculations indicate that the Kitaev interaction in α-RuCl 3 is ferromagnetic and indeed defines the largest exchange energy scale [19,20].…”

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confidence: 99%