Spin dependent impurity effects on the 2D frustrated magnetism of NiGa2S4.

@article{Nambu2008SpinDI,
  title={Spin dependent impurity effects on the 2D frustrated magnetism of NiGa2S4.},
  author={Yusuke Nambu and Satoru Nakatsuji and Yoshiteru Maeno and Edem K. Okudzeto and Julia Y. Chan},
  journal={Physical review letters},
  year={2008},
  volume={101 20},
  pages={
          207204
        }
}
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… 
16 Citations
Spin dynamics and spin freezing in the triangular lattice antiferromagnets FeGa2S4and NiGa2S4
Magnetic susceptibility and muon spin relaxation (muSR) experiments have been carried out on the quasi-2D triangular-lattice spin S = 2 antiferromagnet FeGa2S4. The muSR data indicate a sharp onset
Two-dimensional magnetism and spin-size effect in the S = 1 triangular antiferromagnet NiGa(2)S(4).
  • Y. Nambu, S. Nakatsuji
  • Chemistry, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2011
TLDR
A scaling law with a single energy scale of the Weiss temperature is found as an impurity effect and a hydrostatic pressure effect, providing evidence that it is in-plane interactions in the two-dimensional NiS(2) plane that drive the critical slowing down to the viscous spin liquid state at T(*) = 8.5 K and the spin-wave-like excitations of NiGa( 2)S(4) that emerge below T ∼ 3 K.
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The magnetic properties of two-dimensional antiferromagnet NiGa2S4 have attracted much attention and yet some problems are far from being solved. We investigate the magnetic properties of NiGa2S4 by
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