Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>NaYbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Dai, Peng-Ling; Zhang, Gaoning; Xie, Yaofeng; Duan, Chunruo; Gao, Yonghao; Zhu, Zihao; Feng, Erxi; Tao, Zhen; Huang, Chien-Lung; Cao, Huibo; Podlesnyak, A.; Granroth, G. E.; Everett, S. Michelle; Neuefeind, Jöerg C.; Voneshen, David; Wang, Shun; Tan, Guotai; Morosan, Emilia; Wang, Xia; Lin, Hai‐Qing; Shu, Lei; Chen, Gang; Guo, Yanfeng; Lu, Xingye; Dai, Pengcheng

doi:10.1103/physrevx.11.021044

Cited by 71 publications

(57 citation statements)

References 54 publications

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“…Heat Capacity-A relatively small energy gap between the ground state and the 1st or 2nd excitation states of CEF in KErTe 2 will also have a significant impact on the heat capacity measurement. This was also reflected in the zero-field heat capacity measurement of NaYbSe 2 [9,30,31]. To confirm this and further study the influence of the CEF excitations on the heat capacity at different magnetic fields, we measured the heat capacity of KErTe 2 at zero-field and different magnetic fields.…”

supporting

confidence: 52%

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Liu¹,

Zhang²,

Yan³

et al. 2021

Preprint

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Since discovering the ARECh2 (A=alkali or monovalent ions, RE=rare earth, Ch= chalcogen) triangular lattice quantum spin liquid (QSL) family, its oxide, sulfide, and selenide members have been continuously reported and extensively studied. KErTe2 is the first synthesized telluride member and its spin triangular lattice remains unchanged. It was, however, expected that large tellurium ions could introduce more remarkable magnetic features and electronic structures in this family of materials. In this paper, we performed thermodynamic and electron spin resonance (ESR) measurements to study low-energy magnetic excitations, which were significantly affected by crystalline electric field (CEF) excitations due to relatively small gaps between the CEF ground state and the excited states. Based on the CEF and mean-field (MF) theories, we analyzed systematically and consistently the ESR experiments and thermodynamic measurements including susceptibility, magnetization, and heat capacity. The CEF parameters were successfully extracted by fitting high-temperature (> 20 K) susceptibilities in the ab-plane and along the c-axis, allowing to determine the Lande factors (g ab,calc = 5.98(7) and g c,calc = 2.73(3)). These values were consistent with the values of Lande factors determined by ESR experiments (g ab,exp = 5.69 and gc,exp = 2.75). By applying the CEF and MF theories to the susceptibility and magnetization results, we estimated the anisotropic spin-exchange energies and found that the CEF excitations in KErTe2 played a decisive role in the magnetism above 3 K, while the low-temperature magnetism below 10 K was gradually correlated with the anisotropic spin-exchange interactions. The CEF excitations were demonstrated in the low-temperature heat capacity, where both the positions of two broad peaks and their magnetic field dependence well corroborated our calculations. The present study provides a basis to explore the enriched magnetic and electronic properties of the QSL family.

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supporting

confidence: 52%

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Liu¹,

Zhang²,

Yan³

et al. 2021

Preprint

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“…These results have implications beyond just this material. As noted earlier, triangular lattice CsYbSe 2 and NaYbSe 2 also show features of a QSL phase: with CsYbSe 2 possibly more toward the 𝐽 2 = 0 limit [23], and NaYbSe 2 𝐽 2 /𝐽 1 possibly within the QSL phase [22]. This suggests that the periodic table can be used to "tune" 𝐽 2 /𝐽 1 such that the delafossite lattice can be brought into and out of a QSL phase depending on the Asite element.…”

Section: Discussionmentioning

confidence: 52%

“…In the last decade, Yb 3+ based materials have become popular as QSL candidates because of the Yb 3+ effective 𝑆 = 1/2 state. Most recently, a class of delafossite materials have been proposed as relatively disorder-free QSL candidates, including NaYbO 2 [16][17][18], NaYbS 2 [19,20], NaYbSe 2 [5,22] and CsYbSe 2 [23]. Each of these materials shows diffuse excitations and no long-range magnetic order down to 0.4 K or lower, but because neither are unique to QSL states (both are also caused by spin glass [24], random singlet phases [25], or 2D magnetic order only in the zero temperature limit), they remain QSL candidates only.…”

Section: Introductionmentioning

confidence: 99%

Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe$_2$

Scheie¹,

Ghioldi²,

Xing³

et al. 2021

Preprint

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The Heisenberg triangular lattice quantum spin liquid and the phase transitions to nearby magnetic orders have received much theoretical attention, but clear experimental manifestations of these states are rare. This work investigates a new spin-half Yb 3+ delafossite material, KYbSe 2 , whose inelastic neutron scattering spectra reveal a diffuse continuum with a sharp lower bound. Applying entanglement witnesses to the data reveals multipartite entanglement spread between its neighbors, and analysis of its magnetic exchange couplings shows close proximity to the triangular lattice Heisenberg quantum spin liquid. Key features of the data are reproduced by Schwinger-boson theory and tensor network calculations with a significant second-neighbor coupling 𝐽 2 . The strength of the dynamical structure factor at the 𝐾 point shows a scaling collapse in 𝜔/𝑘 B 𝑇 down to 0.3 K, indicating a second-order quantum phase transition. Comparing this to previous theoretical work suggests that the proximate phase at larger 𝐽 2 is a gapped Z 2 spin liquid, resolving a long-debated issue. We thus show that KYbSe 2 is close to a spin liquid phase, which in turn sheds light on the theoretical phase diagram itself.

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“…Rare-earth-based frustrated spin systems have been attracted much attention [1][2][3][4][5]. This is because the strong spin-orbit coupling and crystalline electric field associated with the rare-earth ion lead to anisotropic exchange interactions, which may induce strong quantum fluctuations and host novel quantum spin states.…”

Section: Introductionmentioning

confidence: 99%

Impurity-Robust Bulk Gapless Excitation in the Yb-Based Zigzag Chain Compound YbCuS₂

Hori

Kinjo

Kitagawa

et al. 2022

J. Phys.: Conf. Ser.

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We have performed 63Cu-nuclear quadrupole resonance (NQR) measurements using a lump sample of the Yb zigzag-chain compound YbCuS2 with a small surface area to investigate the sample dependence of low-temperature magnetic properties in YbCuS2 by comparing with the previous study with different powdered sample. The line width of NQR signals in the present lump sample is larger than that in the previous powdered sample. In addition, the transition temperature T N ∼ 0.92 K in the present lump sample is lower than that in the previous powdered sample (∼ 0.95 K). These results suggest that the quality of the present lump sample is worse than that of the previous powdered sample. However, the T-linear behavior of the nuclear spin-lattice relaxation rate 1/T1 was observed below 0.5 K and the value of 1/T 1 T in both samples is almost the same even though the sample quality and sample geometry are different. This suggests that T-linear behavior in 1/T 1 arises from the impurity-robust bulk gapless excitation inherent in YbCuS2 rather than from sample issues such as the sample quality or geometry.

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Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe2

Cited by 71 publications

References 54 publications

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe$_2$

Impurity-Robust Bulk Gapless Excitation in the Yb-Based Zigzag Chain Compound YbCuS₂

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Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe2

Cited by 71 publications

References 54 publications

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate

Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe$_2$

Impurity-Robust Bulk Gapless Excitation in the Yb-Based Zigzag Chain Compound YbCuS2

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Impurity-Robust Bulk Gapless Excitation in the Yb-Based Zigzag Chain Compound YbCuS₂