High Field ESR and Magnetization of the Triangular Lattice Antiferromagnet NiGa2S4

Abstract

We report the experimental and the analytical results of electron spin resonance (ESR) and magnetization in high magnetic fields 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 disturbing of the development of the spin correlation by $Z_2$-vortices between 23 K and 8.5 K. Below $T_{\mathrm{v}}=8.5$ K, spin-wave calculations based on a 57${}^{\circ }$ spiral spin order well explains the frequency dependence of the ESR resonance fields and high field magnetization processes for $H$$\parallel$$c$ and $H$$\perp$$c$, although the magnetization for $H$$\perp$$c$ at high fields is different from the calculated one. Furthermore, we explain the field independent specific heat with $T^2$-dependence by the same spin-wave calculation, but the magnitude of the specific heat is much less than the observed one. Accordingly, these results suggest the occurrence of a $Z_2$ vortex-induced topological transition at $T_{\mathrm{v}}$ and may indicate quantum effects beyond the descriptions based on the above classical spin models.

References in corpus (9)

• Quadrupolar correlations and spin freezing in S = 1 triangular lattice antiferromagnets
• Z_2-vortex ordering of the triangular-lattice Heisenberg antiferromagnet
• Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa${}_2$S${}_4$ revealed by Ga-NMR, NQR and $\mu$SR measurements
• Unusual superexchange pathways in a Ni triangular lattice of NiGa${}_2$S${}_4$ with negative charge-transfer energy
• Vortex-induced topological transition of the bilinear-biquadratic Heisenberg antiferromagnet on the triangular lattice
• Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4
• First-Order Transition to Incommensurate Phase with Broken Lattice Rotation Symmetry in Frustrated Heisenberg Model
• High Field ESR in the Two-Dimensional Triangular Lattice Antiferromagnet NiGa2S4
• Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li7RuO6 via 7Li NMR

Cited by in corpus (13)

• Quantum Magnetization Plateau in Spin-1 Triangular-Lattice Antiferromagnet Ba${}_3$NiSb${}_2$O${}_9$
• Signature of a Z_2 vortex in the dynamical correlations of the triangular-lattice Heisenberg antiferromagnet
• Magnetic properties of quasi-two-dimensional $S$ = 1/2 Heisenberg antiferromagnet with distorted square lattice
• Z2-vortex order of frustrated Heisenberg antiferromagnets in two dimensions
• First-Order Phase Transition with Breaking of Lattice Rotation Symmetry in Continuous-Spin Model on Triangular Lattice
• Spin dynamics and spin freezing in the triangular lattice antiferromagnets FeGa2S4 and NiGa2S4
• Spin current as a probe of the ${\mathbb{Z}}_2$-vortex topological transition in the classical Heisenberg antiferromagnet on the triangular lattice
• Softened magnetic excitations in the s = 3/2 distorted triangular antiferromagnet alpha-CaCr2O4
• Universal Berezinskii-Kosterlitz-Thouless dynamic scaling in the intermediate timerange in frustrated Heisenberg antiferromagnets on triangular lattice
• Observation of topological $Z_2$ vortex fluctuations in the frustrated Heisenberg magnet NaCrO${}_2$
• Incommensurate Short-Range Order in $S=1$ Triangular Lattice Ising Antiferromagnet
• Weak-coupling Mean-field Theory of Magnetic Properties of NiGa${}_2$S${}_4$
• Experimental benchmark of the quantum-classical crossover in a spin ladder