Synthesis and characterization of the quasi-two-dimensional triangular antiferromagnets Ni1−xMxGa2S4 (M=Mn, Fe, Co, Zn)

Nambu, Yusuke; Ichihara, Masaki; Kiuchi, Yoshihiro; Nakatsuji, Satoru; Maeno, Y.

doi:10.1016/j.jcrysgro.2007.11.222

Cited by 16 publications

(9 citation statements)

References 7 publications

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“…Furthermore, a systematic change of the lattice constants with x [8] and recent x-ray photoemission spectroscopy measurements [12] also suggest that all the M ions have 2 þ valence and are in the HS states. In Fig.…”

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confidence: 89%

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

et al. 2008

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Impurity effects on the triangular antiferromagnets Ni1-xMxGa2S4 (M=Mn, Fe, Co and Zn) are studied. The 2D frozen spin-disordered state of NiGa2S4 is stable against the substitution of Zn2+ (S=0) and Heisenberg Fe2+ (S=2) spins, and exhibits a T2-dependent magnetic specific heat, scaled by the Weiss temperature. In contrast, the substitutions with Co2+ (S=3/2) spin with Ising-like anisotropy and Heisenberg Mn2+ (S=5/2) spin induce a conventional spin glass phase below 1 K. From these comparisons, it is suggested that the integer size of the Heisenberg spins is important to stabilize the 2D coherent behavior observed in the frozen spin-disordered state.

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confidence: 89%

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

et al. 2008

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“…The details of crystal growth were reported in ref. 16. NiGa 2 S 4 belongs to the trigonal system with P " 3 3m1 symmetry and the lattice constants a ¼ b ¼ 0:3624 nm, and c ¼ 1:1999 nm, and has a layered unit consisting of a central magnetic layer of edge-sharing NiS 6 octahedra and two nonmagnetic layers of GaS 4 tetrahedra, in which the magnetic layer is sandwiched, as shown in Fig.…”

Section: Crystal Structurementioning

confidence: 99%

“…These interesting experimental results have stimulated further theoretical and experimental studies of this compound. [5][6][7][8][9][10][11][12][13][14][15][16] A theoretical analysis taking bilinearbiquadratic exchange interactions into consideration seemed to account for some of such unique experimental results. [6][7][8] Strong third-neighbor and negligible second-neighbor exchange interactions are suggested by results of photoem- ission spectroscopy 9) and ab initio calculations using the density functional theory (DFT).…”

Section: Introductionmentioning

confidence: 99%

High-Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa₂S₄

et al. 2010

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We report the experimental and analytical results of electron spin resonance (ESR) and magnetization at high magnetic fields of up to about 68 T of the quasi two-dimensional triangular lattice antiferromagnet NiGa 2 S 4 . From the temperature evolution of the ESR absorption linewidth, we find a distinct disturbance of the development of the spin correlation by Z 2 -vortices between 23 and 8.5 K. Below T v ¼ 8:5 K, spin-wave calculations based on a 57 spiral spin order well explain the frequency dependence of the ESR resonance fields and high-field magnetization processes for H k c and H ? c, although the magnetization for H ? c at high fields is different from the calculated one. Furthermore, we explain the field-independent specific heat with a T 2 dependence by the same spin-wave calculation, but the magnitude of specific heat is much less than the observed one. The single ion anisotropy constant (2010) 023701] is a necessary condition for the realization of a Z 2 -vortex-induced topological transition, which would be destroyed by an extremely small D 6 ¼ 0 in a classical nearest-neighbor spin model owing to the large . Accordingly, these results suggest the occurrence of a Z 2 -vortex-induced topological transition at T v and indicate quantum effects beyond the descriptions based on the above classical spin models, for example, those due to quadrupolar correlations.

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“…NiGa 2 S 4 single crystals were grown using the method outlined in Ref. 30. The resulting crystals are thin plates with the most developed surface parallel to ab plane measuring up to 3 mm by 3 mm and thickness 10 µm.…”

Section: Supplemental Materials Crystal Growth and Preparation For Me...mentioning

confidence: 99%

Impact of the lattice on magnetic properties and possible spin nematicity in the S=1 triangular antiferromagnet NiGa$_2$S$_4$

Valentine,

Higo,

Nambu

et al. 2020

Preprint

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NiGa2S4 is a triangular lattice S=1 system with strong two-dimensionality of the lattice, actively discussed as a candidate to host spin-nematic order brought about by strong quadrupole coupling. Using Raman scattering spectroscopy we identify a phonon of Eg symmetry which can modulate magnetic exchange J1 and produce quadrupole coupling. Additionally, our Raman scattering results demonstrate a loss of local inversion symmetry on cooling, which we associate with sulfur vacancies. This will lead to disordered Dzyaloshinskii-Moriya interactions, which can prevent long range magnetic order. Using magnetic Raman scattering response we identify 160 K as a temperature of an upturn of magnetic correlations. The temperature below 160 K, but above 50 K where antiferromagnetic magnetic start to increase, is a candidate for spin-nematic regime.

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Synthesis and characterization of the quasi-two-dimensional triangular antiferromagnets Ni1−xMxGa2S4 (M=Mn, Fe, Co, Zn)

Cited by 16 publications

References 7 publications

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

High-Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa₂S₄

Impact of the lattice on magnetic properties and possible spin nematicity in the S=1 triangular antiferromagnet NiGa$_2$S$_4$

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Synthesis and characterization of the quasi-two-dimensional triangular antiferromagnets Ni1−xMxGa2S4 (M=Mn, Fe, Co, Zn)

Cited by 16 publications

References 7 publications

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

High-Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa2S4

Impact of the lattice on magnetic properties and possible spin nematicity in the S=1 triangular antiferromagnet NiGa$_2$S$_4$

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High-Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa₂S₄