Less than 50% sublattice polarization in an insulating<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math><b><i>kagomé</i></b>antiferromagnet at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi><mml:mi>≈</mml:mi><m

Lee, S.-H.; Broholm, C.; Collins, M. F.; Heller, L.; Ramirez, A. P.; Kloc, Ch.; Bücher, E.; Erwin, R. W.; Lacevic, Naida

doi:10.1103/physrevb.56.8091

Cited by 89 publications

(95 citation statements)

References 32 publications

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“…The DMI breaks the global SO(3) rotation symmetry of the Hamiltonian down to SO(2) global spin rotation symmetry in the x-y plane. Depending on the frustrated kagomé magnet the in-plane DM component may vanish or negligible [30,[33][34][35]. When it is present, it breaks mirror reflection symmetry of the lattice and global spin rotation symmetry.…”

Section: Arxiv:160804561v12 [Cond-matstr-el] 16 Jan 2017mentioning

confidence: 99%

“…If the in-plane DM component is the dominant anisotropy then it is capable of inducing topological magnon bands. However, due to a dominant out-of-plane DM component in most kagomé antiferromagnetic crystals, the effects of the in-plane DM component is usually suppressed [30,[33][34][35] and can be neglected. This means that the Dirac magnon points will persist.…”

Section: Arxiv:160804561v12 [Cond-matstr-el] 16 Jan 2017mentioning

confidence: 99%

“…Hence, the DMI suppresses the QSL phase of frustrated kagomé antiferromagnets up to a critical value [30]. The syntheses of materials have shown that various experimentally accessible frustrated kagomé antiferromagnets show evidence of coplanar/noncollinear q = 0 LRO at specific temperatures [29][30][31][32][33][34] [36] are fragile in the presence of applied magnetic field or pressure and they show evidence of LRO [37,38]. However, the role of DMI and magnetic field in frustrated kagome magnets has not been investigated in the context of thermal Hall effect and topological spin excitations.…”

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confidence: 99%

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Topological thermal Hall effect in frustrated kagome antiferromagnets

Owerre

2017

Phys. Rev. B

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In frustrated magnets the Dzyaloshinsky-Moriya interaction (DMI) arising from spin-orbit coupling (SOC) can induce a magnetic long-range order. Here, we report a theoretical prediction of thermal Hall effect in frustrated kagomé magnets such as KCr3(OH)6(SO4)2 and KFe3(OH)6(SO4)2. The thermal Hall effects in these materials are induced by scalar spin chirality as opposed to DMI in previous studies. The scalar spin chirality originates from magnetic-field-induced chiral spin configuration due to non-coplanar spin textures, but in general it can be spontaneously developed as a macroscopic order parameter in chiral quantum spin liquids. Therefore, we infer that there is a possibility of thermal Hall effect in frustrated kagomé magnets such as herbertsmithite ZnCu3(OH)6Cl2 and the chromium compound Ca10Cr7O28, although they also show evidence of magnetic long-range order in the presence of applied magnetic field or pressure.Introduction-. Topological phases of matter are an active research field in condensed matter physics, mostly dominated by electronic systems. Quite recently the concepts of topological matter have been extended to nonelectronic bosonic systems such as quantized spin waves (magnons) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and quantized lattice vibrations (phonons) [18][19][20][21][22][23]. In the former, spin-orbit coupling manifests in the form of Dzyaloshinsky-Moriya interaction [24,25] and it leads to topological spin excitations and chiral edge modes in collinear ferromagnets [5,6]. The quantized spin waves or magnons are charge-neutral quasiparticles and they do not experience a Lorentz force as in charge particles. However, a temperature gradient can induce a heat current and the DMI-induced Berry curvature acts as an effective magnetic field in momentum space. This leads to a thermal version of the Hall effect characterized by a temperature dependent thermal Hall conductivity [1,3]. Thermal Hall effect is now an emerging active research area for probing the topological nature of magnetic spin excitations in quantum magnets. The thermal Hall effect of spin waves has been realized experimentally in a number of pyrochlore ferromagnets [2,4]. Recently, DMI-induced topological magnon bands and thermal Hall effect have been observed in collinear kagomé ferromagnet Cu(1-3, bdc) [8,9].In frustrated kagomé magnets, however, there is no magnetic long-range order (LRO) down to the lowest accessible temperatures. The classical ground states have an extensive degeneracy and they are considered as candidates for quantum spin liquid (QSL) [26,27]. The ground state of spin-1/2 Heisenberg model on the kagomé lattice is believed to be a U(1)-Dirac spin liquid [28]. In physical realistic materials, however, there are other interactions and perturbations that tend to alleviate QSL ground states and lead to LRO. Recent experimental syntheses of kagomé antiferromagnetic materials have shown that the effects of SOC or DMI are not negligible in frustrated magnets. The DMI is an intrinsic pertur...

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Section: Arxiv:160804561v12 [Cond-matstr-el] 16 Jan 2017mentioning

confidence: 99%

Section: Arxiv:160804561v12 [Cond-matstr-el] 16 Jan 2017mentioning

confidence: 99%

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confidence: 99%

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Topological thermal Hall effect in frustrated kagome antiferromagnets

Owerre

2017

Phys. Rev. B

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“…The absolute efficiency of the detection system was measured using incoherent elastic scattering from vanadium and nuclear Bragg peaks from the samples. The corresponding correction factor was applied to the background subtracted data to obtain normalized measurements of the magnetic scattering cross section [43]. (2) and (3) respectively, also discussed in the text.…”

Section: Methodsmentioning

confidence: 99%

Néel to spin-glass-like phase transition versus dilution in geometrically frustratedZnCr2−2xGa2x
Lee
¹
,
Ratcliff
²
,
Huang
³

et al. 2008
Phys. Rev. B
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ZnCr2O4 undergoes a first order spin-Peierls-like phase transition at 12.5 K from a cubic spin liquid phase to a tetragonal Neél state.[1] Using powder diffraction and single crystal polarized neutron scattering, we determined the complex spin structure of the Neél phase. This phase consisted of several magnetic domains with different characteristic wave vectors. This indicates that the tetragonal phase of ZnCr2−2xGa2xO4 is very close to a critical point surrounded by many different Neél states. We have also studied, using elastic and inelastic neutron scattering techniques, the effect of nonmagnetic dilution on magnetic correlations in ZnCr2−2xGa2xO4 (x=0.05 and 0.3). For x=0.05, the magnetic correlations do not change qualitatively from those in the pure material, except that the phase transition becomes second order. For x= 0.3, the spin-spin correlations become short range. Interestingly, the spatial correlations of the frozen spins in the x=0.3 material are the same as those of the fluctuating moments in the pure and the weakly diluted materials.

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“…The experimental studies on a number of spin-3/2 KHAF materials such as S rCr 8 Ga 4 O 19 [25], S rCr 8 Ga 4−x M x O 19 (M = Zn, Mg, Cu) [26], Ba 2 S n 2 ZnGa 10−7p Cr 7p O 22 [27], and Crjarosite KCr 3 (OH) 6 (S O 4 ) 2 [28], etc., have produced diverse results, leading to different even contradictory conclusions on the nature of the spin-3/2 KHAF. For instance, there are studies showing that it has no antiferromagnetic long-range order but undergoes a spin-glass transition [25][26][27], while some others reported that it possesses a long-range order with a nearly 120 • structure [28,29]. On the theoretical aspect, a direct study on overall ground-state as well as thermodynamic properties of the spin-3/2 KHAF is still sparse.…”

Section: Introductionmentioning

confidence: 99%

Spin-ordered ground state and thermodynamic behaviors of the spin-32kagome Heisenberg antiferromagnet

Liu

2016

Phys. Rev. E

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Three different tensor network (TN) optimization algorithms are employed to accurately determine the ground state and thermodynamic properties of the spin-3/2 kagome Heisenberg antiferromagnet. We found that the √ 3 × √ 3 state (i.e., the state with 120 • spin configuration within a unit cell containing 9 sites) is the ground state of this system, and such an ordered state is melted at any finite temperature, thereby clarifying the existing experimental controversies. Three magnetization plateaus (m/m s = 1/3, 23/27, and 25/27) were obtained, where the 1/3-magnetization plateau has been observed experimentally. The absence of a zero-magnetization plateau indicates a gapless spin excitation that is further supported by the thermodynamic asymptotic behaviors of the susceptibility and specific heat. At low temperatures, the specific heat is shown to exhibit a T 2 behavior, and the susceptibility approaches a finite constant as T → 0. Our TN results of thermodynamic properties are compared with those from high temperature series expansion. In addition, we disclose a quantum phase transition between q = 0 state (i.e. the state with 120 • spin configuration within a unit cell containing three sites) and √ 3 × √ 3 state in a spin-3/2 kagome XXZ model at the critical point ∆ c = 0.54. This study provides reliable and useful information for further explorations on high spin kagome physics.

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Less than 50% sublattice polarization in an insulatingS=32kagoméantiferromagnet atT≈

Cited by 89 publications

References 32 publications

Topological thermal Hall effect in frustrated kagome antiferromagnets

Topological thermal Hall effect in frustrated kagome antiferromagnets

Néel to spin-glass-like phase transition versus dilution in geometrically frustratedZnCr2−2xGa2x
Lee
¹
,
Ratcliff
²
,
Huang
³

et al. 2008
Phys. Rev. B
Self Cite

Spin-ordered ground state and thermodynamic behaviors of the spin-32kagome Heisenberg antiferromagnet

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Less than 50% sublattice polarization in an insulatingS=32kagoméantiferromagnet atT≈

Cited by 89 publications

References 32 publications

Topological thermal Hall effect in frustrated kagome antiferromagnets

Topological thermal Hall effect in frustrated kagome antiferromagnets

Néel to spin-glass-like phase transition versus dilution in geometrically frustratedZnCr2−2xGa2xLee1, Ratcliff2, Huang3 et al. 2008Phys. Rev. BSelf Cite

Spin-ordered ground state and thermodynamic behaviors of the spin-32kagome Heisenberg antiferromagnet

Contact Info

Product

Resources

About

Néel to spin-glass-like phase transition versus dilution in geometrically frustratedZnCr2−2xGa2x
Lee
¹
,
Ratcliff
²
,
Huang
³

et al. 2008
Phys. Rev. B
Self Cite