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Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4

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arxiv 0811.1057 v1 pith:UV6ILFJI submitted 2008-11-06 cond-mat.str-el

Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4

D. E. MacLaughlin , Y. Nambu , S. Nakatsuji , R. H. Heffner , Lei Shu , O. O. Bernal , K. Ishida This is my paper
classification cond-mat.str-el
keywords spinfluctuationsfreezingniga2s4antiferromagnetbelowdependencemuon
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Muon spin rotation (muSR) experiments reveal unconventional spin freezing and dynamics in the two-dimensional (2D) triangular lattice antiferromagnet NiGa2S4. Long-lived disordered Ni-spin freezing (correlation time > 10-6 s at 2 K) sets in below T_f = 8.5 +- 0.5 K with a mean-field-like temperature dependence. The observed exponential temperature dependence of the muon spin relaxation above T_f is strong evidence for 2D critical spin fluctuations. Slow Ni spin fluctuations coexist with quasistatic magnetism at low temperatures but are rapidly suppressed for fields > 10 mT, in marked contrast with the field-independent specific heat. The muSR and bulk susceptibility data indicate a well-defined 2D phase transition at T_f, below which NiGa2S4 is neither a conventional magnet nor a singlet spin liquid.

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