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College Park, Maryland      June 6 - 10 , 2004

TP63: Magnetic Order and Spin Dynamics in Triangular Magnets

Y. Li, Z. M. Hasan (Princeton University), S. Park, J. W. Lynn (NIST Center for Neutron Research), W. Ratcliff, S. Cheong (Rutgers University)

We have recently studied two classes of triangular spin systems - Seignette magnets and Thiospinels. Our studies of Ba3CoSb2O9, Ba3NiSb2O9 Seignette (2-D xy Heisenberg) magnets suggest that these systems exhibit 3-D long-range order at low temperatures without coupling to the lattice and exhibit conventional spin dynamics. On the other hand, 3-D topologically frustrated magnets such as thiospinels take more complex paths to ordering. For example, ZnCr2S4 first enters a helical long-range ordered phase before coupling to the lattice but only at lower temperatures achieves a 3-D commensurate order and exhibits a local resonance similar to the oxide counterpart. This complex magnetism in this system is a direct consequence of competing interactions under geometrical constraints.

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