Spin disorder and order in quasi-2D triangular heisenberg antiferromagnets: Comparative study of FeGa2S4, Fe2Ga2S5, and NiGa2S4

S. Nakatsuji, H. Tonomura, K. Onuma, Y. Nambu, O. Sakai, Y. Maeno, R. T. MacAluso, Julia Y. Chan

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number157203
JournalPhysical review letters
Volume99
Issue number15
DOIs
Publication statusPublished - 2007 Oct 11
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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