Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra

Rau, Jeffrey G.; Gingras, Michel J. P.

doi:10.1103/physrevb.98.054408

Cited by 116 publications

(112 citation statements)

References 100 publications

(329 reference statements)

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“…A clear and well-resolved Yb 3+ spin resonance was recently reported for the delafossite system NaYbS 2 providing local information on the Yb 3+ g-factor and spin dynamics [7]. For theoretical treatments for instance on the anisotropic exchange of triangular-lattice Yb magnets [8] ESR-obtained g factors are important parameters to compare with. Here we present ESR results on various Yb-based delafossite systems differing in their anisotropic exchange and crystal electric field splitting of the Yb Kramers doublets.…”

Section: Introductionmentioning

confidence: 91%

Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study

Sichelschmidt

Schmidt

Schlender

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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We investigated the spin dynamics by electron spin resonance (ESR) of the Yb-based, effective spin-1/2 delafossites NaYbO 2 , AgYbO 2 , LiYbS 2 , NaYbS 2 , and NaYbSe 2 which all show an absence of magnetic order down to lowest reachable temperatures and thus are prime candidates to host a quantum spin-liquid ground state in the vicinity of long range magnetic order. Clearly resolved ESR spectra allow to obtain well-defined g values which are determined by the crystal field of the distorted octahedral surrounding of the Yb-ions in trigonal symmetry. This local crystal field information provides important input to characterize the effective S = 1/2 Kramers doublet as well as the anisotropic exchange coupling between the Yb ions which is crucial for the nature of the groundstate. The ESR linewidth ∆B is characterised by the spin dynamics and is mainly determined by the anisotropic exchange coupling. We discuss and compare ∆B of the above mentioned delafossites focussing on the low temperature behaviour which is dominated by the growing influence of spin correlations.

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Section: Introductionmentioning

confidence: 91%

Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study

Sichelschmidt

Schmidt

Schlender

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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“…Meanwhile, the value of x for the 4 f 9 case was estimated as x −0.821, for which probably the system takes the Γ 6 doublet. Therefore, in the 4 f -electron cases, there are four good [76]. In the cases of 5 f electrons, among natural elements up to Uranium, the possible Kramers doublet is limited to 5 f 1 (e.g., Pa 4+ and U 5+ ) and 5 f 3 (U 3+ ) electron configurations.…”

Section: F -Electron Manifoldmentioning

confidence: 99%

Materials design of Kitaev spin liquids beyond the Jackeli–Khaliullin mechanism

Motome

Sano

Jang

et al. 2020

J. Phys.: Condens. Matter

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The Kitaev spin liquid provides a rare example of well-established quantum spin liquids in more than one dimension. It is obtained as the exact ground state of the Kitaev spin model with bond-dependent anisotropic interactions. The peculiar interactions can be yielded by the synergy of spin-orbit coupling and electron correlations for specific electron configuration and lattice geometry, which is known as the Jackeli-Khaliullin mechanism. Based on this mechanism, there has been a fierce race for the materialization of the Kitaev spin liquid over the last decade, but the candidates have been still limited mostly to 4d-and 5d-electron compounds including cations with the low-spin d 5 electron configuration, such as Ir 4+ and Ru 3+ . Here we discuss recent efforts to extend the material perspective beyond the Jackeli-Khaliullin mechanism, by carefully reexamining the two requisites, formation of the j eff = 1/2 doublet and quantum interference between the exchange processes, for not only dbut also f -electron systems. We present three examples: the systems including Co 2+ and Ni 3+ with the high-spin d 7 electron configuration, Pr 4+ with the f 1 -electron configuration, and polar asymmetry in the lattice structure. In particular, the latter two are intriguing since they may realize the antiferromagnetic Kitaev interactions, in contrast to the ferromagnetic ones in the existing candidates. This partial overview would stimulate further material exploration of the Kitaev spin liquids and its topological properties due to fractional excitations.

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“…Rare-earth based frustrated spin systems have recently gained much attention [18,19]. The strong spin-orbit coupling (SOC) associated with the rare-earth ion leads to highly anisotropic and bond-dependent exchange interactions between the moments and may host strong quantum fluctuations, which can play a crucial role in stabilising the QSL state [20][21][22][23].…”

mentioning

confidence: 99%

Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2

et al. 2019

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High-quality single crystals of NaYbSe2, which resembles a perfect triangular-lattice antiferromagnet without the intrinsic disorder, are investigated by magnetization and specific-heat, as well as the local probe techniques nuclear magnetic resonance (NMR) and electron spin resonance (ESR). The low-field measurements confirm the absence of any spin freezing or long-range magnetic order down to 50 mK, which suggests a quantum spin liquid ground (QSL) state with gapless excitations. Instability of the QSL state is observed upon applying magnetic fields. For the H⊥c direction, a field-induced magnetic phase transition is observed above 2 T from the Cp(T ) data, agreeing with a clear Ms 3 plateau of M (H), which is associated with an up-up-down (uud) spin arrangement. For the H c direction, a field-induced transition could be evidenced at a much higher field range (9 -21 T). The 23 Na NMR measurements provide microscopic evidence for field-induced ordering for both directions. A reentrant behaviour of TN, originating from the thermal and quantum spin fluctuations, is observed for both directions. The anisotropic exchange interactions J ⊥ 4.7 K and Jz 2.33 K are extracted from the modified bond-dependent XXZ model for the spin-1 2 triangular-lattice antiferromagnet. The absence of magnetic long-range order at zero fields is assigned to the effect of strong bond-frustration, arising from the complex spin-orbit entangled 4f ground state. Finally, we derive the highly anisotropic magnetic phase diagram, which is discussed in comparison with the existing theoretical models for spin-1 2 triangular-lattice antiferromagnets. :1911.12712v1 [cond-mat.str-el] arXiv

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Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra

Cited by 116 publications

References 100 publications

Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study

Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study

Materials design of Kitaev spin liquids beyond the Jackeli–Khaliullin mechanism

Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2

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Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra

Cited by 116 publications

References 100 publications

Effective Spin-1/2 Moments on a Yb3+ Triangular Lattice: An ESR Study

Effective Spin-1/2 Moments on a Yb3+ Triangular Lattice: An ESR Study

Materials design of Kitaev spin liquids beyond the Jackeli–Khaliullin mechanism

Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2

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Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study

Effective Spin-1/2 Moments on a Yb³⁺ Triangular Lattice: An ESR Study