Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

The temporal magnetic correlations of the triangular-lattice antiferromagnet NiGa_{2}S_{4} are examined through 13 decades (10^{-13}-1 sec) using ultrahigh-resolution inelastic neutron scattering, muon spin relaxation, and 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

Keywords:

• Condensed matter physics
• Inelastic neutron scattering
• Antiferromagnetism
• Muon spin spectroscopy
• Microsecond
• Hertz
• Spin-½
• Physics
• Nuclear magnetic resonance
• Terahertz radiation
• Hexagonal lattice
• Atomic physics
• Orders of magnitude (numbers)

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