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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 15
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Phys. Rev. Lett. 99, 157203 (2007) [4 pages]

Spin Disorder and Order in Quasi-2D Triangular Heisenberg Antiferromagnets: Comparative Study of FeGa2S4, Fe2Ga2S5, and NiGa2S4

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S. Nakatsuji1,2, H. Tonomura1, K. Onuma1, Y. Nambu1,2, O. Sakai1, Y. Maeno1, R. T. Macaluso3, and Julia Y. Chan3
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
2Institute for Solid State Physics, University of Tokyo, Kashiwa, 277-8581, Japan
3Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA

Received 21 January 2007; revised 11 July 2007; published 11 October 2007

Our single crystal study reveals that the single-layer S=2 triangular Heisenberg antiferromagnet FeGa2S4 forms a frozen spin-disordered state, similar to the S=1 isostructural magnet NiGa2S4. In this state, the magnetic specific heat CM is not only insensitive to the field, but shows a T2 dependence that scales to CM of NiGa2S4, suggesting the same underlying mechanism of the 2D coherent behavior. In contrast, the bilayer system Fe2Ga2S5 exhibits a 3D antiferromagnetic order.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.157203
DOI:
10.1103/PhysRevLett.99.157203
PACS:
75.40.Cx, 75.50.Bb, 75.50.Ee
 
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