Publisher’s Note: Neutron-Scattering Measurement of Incommensurate Short-Range Order in Single Crystals of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo mathvariant="bold">=</mml:mo><mml:mn>1</mml:mn></mml:math>Triangular Antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NiGa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">S</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:m

Stock, Chris; Jonas, Seth; Broholm, C.; Nakatsuji, Satoru; Nambu, Yusuke; Onuma, Kazuo; Maeno, Y.; Chung, Jaiho

doi:10.1103/physrevlett.110.099901

Cited by 20 publications

(29 citation statements)

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“…In 2010, neutron scattering measurements provided clear evidence for quasi‐2D incommensurate short‐range order at low temperature. It was also concluded that the low energy physics is well described by a ferromagnetic NN coupling ( J 1 = 0.35 meV) and a much larger antiferromagnetic NNN coupling ( J 3 = –2.8 meV) . From high‐field electron spin resonance spectroscopy, an estimate of the parameters was extracted for a model Hamiltonian that only involves J 3 = –2.0 meV and an axial ZFS parameter D = 0.08 meV .…”

Section: Introductionmentioning

confidence: 99%

Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

et al. 2017

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The magnitude of the parameters of the various proposed model Hamiltonians used to model the macroscopic properties of NiGa2S4 and to interpret experimental observations has been the subject of controversy for more than a decade. Both the nature of the relevant operators (magnetic couplings, biquadratic exchange, and anisotropic terms) and the values of their corresponding interactions are far from settled. Through effective Hamiltonian theory and correlated relativistic ab initio calculations, theoretical chemistry can rigorously extract all the required operators and the magnitudes of their corresponding interactions. In this article, we report the values of all relevant interactions. Contrarily to what is often reported, it is shown that: (1) the biquadratic exchange is negligible and smaller than the three‐body terms, (2) the nearest‐neighbor interaction is ferromagnetic and dominant, (3) the next‐nearest‐neighbor coupling is ferromagnetic and small, (4) the next‐next‐nearest‐neighbor coupling is antiferromagnetic and three times smaller than the nearest‐neighbor interaction, and (5) the axial parameter for the local magnetic anisotropy is of the same order of magnitude as the nearest‐neighbor magnetic coupling.

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Section: Introductionmentioning

confidence: 99%

Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

et al. 2017

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“…Figure 2 shows the temperature dependence of nominally elastic magnetic neutron scattering from polycrystalline NiGa 2 S 4 as measured with varying spectrometer energy resolutions. The data were obtained on thermal-and cold-neutron triple-axis spectrometers, and backscattering spectrometer [17].…”

Section: Fig 2: (Color Online)mentioning

confidence: 99%

“…Temperature dependence of the elastic channel data from NiGa2S4. The nominally elastic signals of the magnetic diffuse scattering from polycrystalline NiGa2S4 are obtained using thermal-neutron (energy-resolution δE = 2.96, 1.27 meV) and cold-neutron (δE = 0.37, 0.12 meV, 50.9 µeV) triple-axis spectrometers at the wave vector Q = 0.58Å −1 , and the backscattering spectrometer (δE = 0.8 µeV) at Q = 0.76Å −1 [17].…”

Section: Fig 2: (Color Online)mentioning

confidence: 99%

“…The dashed curve in (a) and the solid curve towards T * in (b) are guides to the eyes. a strongly two-dimensional magnet where spin correlations do not extend beyond nearest-neighbor planes [17]. Indeed, a study of the effects of nonmagnetic impurities indicates quantum collective phenomena in NiGa 2 S 4 are controlled by intra-plane interactions [18].…”

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confidence: 99%

“…Elasticchannel data were taken on the GPTAS and HER tripleaxis spectrometers at the JRR-3 research reactor. The backscattering data were taken on the high flux backscattering (HFBS) instrument at the NIST Center for Neutron Research (NCNR) [17]. Neutron spin-echo experiments were performed on the NG5-NSE at NCNR and iNSE spectrometers at the JRR-3.…”

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Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

et al. 2015

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The temporal magnetic correlations of the triangular lattice antiferromagnet NiGa2S4 are examined through thirteen decades (10 −13 −1 sec) using ultra-high-resolution inelastic neutron scattering, muon spin relaxation, AC and nonlinear susceptibility measurements. Unlike the short-ranged spatial correlations, the temperature dependence of the temporal correlations show distinct anomalies. The spin fluctuation rate decreases precipitously upon cooling towards T * = 8.5 K, but fluctuations on the microsecond time scale then persist in an anomalous dynamical regime for 4 K < T ≤ T * . As this time scale exceeds that of single site dynamics by six orders of magnitude, these fluctuations bear evidence of emergent degrees of freedom within the short-range correlated incommensurate state of NiGa2S4.PACS numbers: 75.40. Gb, 78.70.Nx, 76.75.+i, 75.30.Cr The two dimensional triangular lattice plays a prominent role in the field of frustrated magnetism. While it now seems clear that the conventional triangular lattice antiferromagnet has long-range non-collinear 120 degree Néel order irrespective of the spin quantum number, S [1-3], experiments on materials with generalized longer range interactions, spin-orbit interactions, as well as lattice distortions point to a rich variety of phases in the vicinity of the Néel phase [4,5]. In the quantum limit (S = 1/2) first considered by Anderson [6], experiments on organic materials suggest a gapless spin liquid with a spinon Fermi surface may exist near the metal insulator transition [7]. Recent exact-diagonalization showed such quantum spin-liquid states can be stabilized by the presence of randomness in the near-neighbor interactions [8]. Deep in the insulating limit, neutron scattering experiments suggest conventional spin waves may be supplemented or replaced by a spinon-like continuum even when long-range order is present [9].For larger spin quantum numbers theoretical [10] and experimental [11] work points to complex slow spin dynamics that is still poorly understood. Here we focus on * Present address: Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan such dynamics in the S = 1 triangular lattice antiferromagnet NiGa 2 S 4 [12, 13], which is distinguished by a 2D incommensurate critical wave vector and the potential for spin-nematic interactions [14,15]. Using high energy resolution inelastic neutron scattering, neutron spin echo, muon spin relaxation (µSR), and AC magnetometry, we provide evidence for emergent MHz spin dynamics over a wide range of temperatures. We argue such slow spin dynamics is associated with emergent topologically protected degrees of freedom inherent to incommensurate magnetism on the triangular lattice.Polycrystalline samples of NiGa 2 S 4 were synthesized by solid state reaction described elsewhere [16]. Elasticchannel data were taken on the GPTAS and HER tripleaxis spectrometers at the JRR-3 research reactor. The backscattering data were taken on the high flux backscattering (HFBS) instrument at the NIST Cente...

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Multiply periodic states and isolated skyrmions in an anisotropic frustrated magnet

2015

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Multiply periodic states appear in a wide variety of physical contexts, such as the Rayleigh–Bénard convection, Faraday waves, liquid crystals and skyrmion crystals recently observed in chiral magnets. Here we study the phase diagram of an anisotropic frustrated magnet which contains five different multiply periodic states including the skyrmion crystal. We clarify the mechanism for stabilization of these states and discuss how they can be observed in magnetic resonance and electric polarization measurements. We also find stable isolated skyrmions with topological charge 1 and 2. Their spin structure, interactions and dynamics are more complex than those in chiral magnets. In particular, magnetic resonance in the skyrmion crystal should be accompanied by oscillations of the electric polarization with a frequency depending on the amplitude of the a.c. magnetic field. These results show that skyrmion materials with rich physical properties can be found among frustrated magnets. We formulate rules to help the search.

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Publisher’s Note: Neutron-Scattering Measurement of Incommensurate Short-Range Order in Single Crystals of theS=1Triangular AntiferromagnetNiGa2S4

Cited by 20 publications

References 0 publications

Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

Multiply periodic states and isolated skyrmions in an anisotropic frustrated magnet

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Publisher’s Note: Neutron-Scattering Measurement of Incommensurate Short-Range Order in Single Crystals of theS=1Triangular AntiferromagnetNiGa2S4

Cited by 20 publications

References 0 publications

Study of the Electronic Structure of NiGa2S4 and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

Study of the Electronic Structure of NiGa2S4 and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

Multiply periodic states and isolated skyrmions in an anisotropic frustrated magnet

Contact Info

Product

Resources

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Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations

Study of the Electronic Structure of NiGa₂S₄ and Extraction of the Spin Hamiltonian Parameters from Ab Initio Calculations