Magnetic Properties of an Effective Spin-$\frac{1}{2}$ Triangular-Lattice Compound LiYbS<sub>2</sub>

Ranjith, K. M.; Schlender, Philipp; Doert, Th.; Baenitz, M.

doi:10.7566/jpscp.30.011094

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Furthermore, consistent with magnetic susceptibility data discussed previously, a sharp anomaly representative of the onset of long-range order in the system was not observed down to 70 mK. All this evidence suggests a possible ideal QSL GS for LiYbSe 2 compared to other frustrated systems LiYbS 2 , NaYbSe 2 , and NaYbO 2 due to its higher frustration parameter ( f = θ CW /T C ; 8/<0.07). ,, The calculated magnetic entropy (Δ S mag ) and the field dependence with varying fields of 4, 8, and 12 T is given in Figure f. It was observed that Δ S mag does not reach the Rln2 limit, which is expected for an effective spin, S eff = 1/2 up to T ∼ 20 K. This indicates that there is residual entropy at 70 mK, while whether this would be enough for a further magnetic transition remains unknown.…”

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confidence: 84%

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice

et al. 2022

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Three-dimensionally (3D) frustrated magnets generally exist in the magnetic diamond and pyrochlore lattices, in which quantum fluctuations suppress magnetic orders and generate highly entangled ground states. LiYbSe 2 in a previously unreported pyrochlore lattice was discovered from LiCl flux growth. Distinct from the quantum spin liquid (QSL) candidate NaYbSe 2 hosting a perfect triangular lattice of Yb 3+ , LiYbSe 2 crystallizes in the cubic pyrochlore structure with space group Fd3m (No. 227). The Yb 3+ ions in LiYbSe 2 are arranged on a network of corner-sharing tetrahedra, which is particularly susceptible to geometrical frustration. According to our temperature-dependent magnetic susceptibility measurements, the dominant antiferromagnetic interaction in LiYbSe 2 is expected to appear around 8 K. However, no long-range magnetic order is detected in thermomagnetic measurements above 70 mK. Specific heat measurements also show magnetic correlations shifting with applied magnetic field with a degree of missing entropy that may be related to the slight mixture of Yb 3+ on the Li site. Such magnetic frustration of Yb 3+ is rare in pyrochlore structures. Thus, LiYbSe 2 shows promise in intrinsically realizing disordered quantum states like QSL in pyrochlore structures.

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confidence: 84%

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice

et al. 2022

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“…2 schematically shows the energy levels of a single Yb 3+ ion. The fourteen 4f 13 states of Yb 3+ with = 3, s = 1/2 are split by the spin-orbit coupling into a j = +s octet and a j = − s sextet. In a perfect octahedral (cubic) environment with ideal tilting angle α, the j = 7/2 states are further split into two doublets Γ 6 and Γ 7 and a Γ 8 quartet, the j = 5/2 states into a Γ 7 doublet and a Γ 8 quartet.…”

Section: A Crystallographymentioning

confidence: 99%

Yb delafossites: unique exchange frustration of 4f spin 1/2 moments on a perfect triangular lattice

Schmidt,

Sichelschmidt,

Ranjith

et al. 2021

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While the Heisenberg model for magnetic Mott insulators on planar lattice structures is comparatively well understood in the case of transition metal ions, the intrinsic spin-orbit entanglement of 4f magnetic ions on such lattices shows fascinating new physics largely due to corresponding strong anisotropies both in their single-ion and their exchange properties. We show here that the Yb delafossites, containing perfect magnetic Yb 3+ triangular lattice planes with pseudospin s = 1/2 at low temperatures, are an ideal platform to study these new phenomena. Competing frustrated interactions may lead to an absence of magnetic order associated to a gapless spin liquid ground state with a huge linear specific heat exceeding that of many heavy fermions, whereas the application of a magnetic field induces anisotropic magnetic order with successive transitions into different long ranged ordered structures. In this comparative study, we discuss our experimental findings in terms of a unified crystal-field and exchange model. We combine electron paramagnetic resonance (EPR) experiments and results from neutron scattering with measurements of the magnetic susceptibility, isothermal magnetization up to full polarization, and specific heat to determine the relevant model parameters. The impact of the crystal field is discussed as well as the symmetry-compatible form of the exchange tensor, and we give explicit expressions for the anisotropic g factor, the temperature dependence of the susceptibility, the exchange-narrowed EPR linewidth and the saturation field.

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“…[41][42][43][44][45][46][47] Further, no long-range order has been observed in heat capacity at zero field down to mK temperatures at low magnetic fields. 33,[48][49][50][51][52][53][54][55][56] Quantum disordered or QSL ground state is proposed in NaYbO 2 48,51,57 and the signature of the magnetic excitation continuum has been found in NaYbSe 2 from 0.1 to 2.5 meV in inelastic neutron scattering (INS) measurement, suggesting the ground state of NaYbSe 2 is a QSL with a spinon Fermi surface. 58 The continuum-like excitation with shortrange order has been found in CsYbSe 2 , indicating it may be located close to the critical boundary between QSL and 120 • phase.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Anisotropic Magnetism in Quantum Spin Liquid Candidates $A$YbSe$_2$ ($A$ = K and Rb)

Xing,

Sanjeewa,

May

et al. 2021

Preprint

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Quantum spin liquid (QSL) state in rare-earth triangular lattice has attracted much attention recently due to its potential application in quantum computing and communication. Here we report the single-crystal growth synthesis, crystal structure characterizations and magnetic properties of AYbSe 2 (A= K, Rb) compounds. The X-ray diffraction analysis shows that AYbSe 2 (A = K and Rb) crystallizes in a trigonal space group, R-3m (No. 166) with Z = 3. AYbSe 2 possesses a two-dimensional (2D) Yb-Se-Yb layered structure formed by edged-shared YbSe 6 octahedra. The magnetic properties are highly anisotropic for both title compounds and no long-range order is found down to 0.4 K, revealing the possible QSL ground state in these compounds. The isothermal magnetization exhibits one-third magnetization plateau when the magnetic fields are applied in ab-plane. Heat capacity is performed along both ab-plane and c-axis, and features the characteristic dome for triangular magnetic lattice compounds as a function of magnetic fields. Due to the change of the interlayer and intralayer distance of Yb 3+ , the dome shifts to low fields from KYbSe 2 to RbYbSe 2 . All these results indicate the AYbSe 2 family presents unique frustrated magnetism close to the possible QSL and noncolinear spin states.

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Magnetic Properties of an Effective Spin-\(\frac{1}{2}\) Triangular-Lattice Compound LiYbS₂

Cited by 7 publications

References 26 publications

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice

Yb delafossites: unique exchange frustration of 4f spin 1/2 moments on a perfect triangular lattice

Synthesis and Anisotropic Magnetism in Quantum Spin Liquid Candidates $A$YbSe$_2$ ($A$ = K and Rb)

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Magnetic Properties of an Effective Spin-\(\frac{1}{2}\) Triangular-Lattice Compound LiYbS2

Cited by 7 publications

References 26 publications

LiYbSe2: Frustrated Magnetism in the Pyrochlore Lattice

LiYbSe2: Frustrated Magnetism in the Pyrochlore Lattice

Yb delafossites: unique exchange frustration of 4f spin 1/2 moments on a perfect triangular lattice

Synthesis and Anisotropic Magnetism in Quantum Spin Liquid Candidates $A$YbSe$_2$ ($A$ = K and Rb)

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Magnetic Properties of an Effective Spin-\(\frac{1}{2}\) Triangular-Lattice Compound LiYbS₂

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice

LiYbSe₂: Frustrated Magnetism in the Pyrochlore Lattice