Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

Yusuke Nambu, Jason S. Gardner, Douglas E. MacLaughlin, Chris Stock, Hitoshi Endo, Seth Jonas, Taku J. Sato, Satoru Nakatsuji, Collin Broholm

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Abstract

The temporal magnetic correlations of the triangular-lattice antiferromagnet NiGa2S4 are examined through 13 decades (10-13-1sec) 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∗=8.5K, but fluctuations on the microsecond time scale then persist in an anomalous dynamical regime for 4K<T≤T∗. As this time scale exceeds that of single-site dynamics by 6 orders of magnitude, these fluctuations bear evidence of emergent degrees of freedom within the short-range correlated incommensurate state of NiGa2S4.

Original languageEnglish
Article number127202
JournalPhysical review letters
Volume115
Issue number12
DOIs
Publication statusPublished - 2015 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Nambu, Y., Gardner, J. S., MacLaughlin, D. E., Stock, C., Endo, H., Jonas, S., Sato, T. J., Nakatsuji, S., & Broholm, C. (2015). Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice. Physical review letters, 115(12), [127202]. https://doi.org/10.1103/PhysRevLett.115.127202