Spin and orbital frustration in MnSc_2S_4 and FeSc_2S_4

Details Spin and orbital frustration in MnSc_2S_4 and FeSc_2S_4 Spin and orbital frustration in MnSc_2S_4 and FeSc_2S_4

2004-02-19

arxiv.org/abs/cond-mat/0402495v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.116401

Crystal structure, magnetic susceptibility, and specific heat were measured in the normal cubic spinel compounds MnSc_2S_4 and FeSc_2S_4. Down to the lowest temperatures, both compounds remain cubic and reveal strong magnetic frustration. Specifically the Fe compound is characterized by a Curie-Weiss temperature \Theta_{CW}= -45 K and does not show any indications of order down to 50 mK. In addition, the Jahn-Teller ion Fe^{2+} is orbitally frustrated. Hence, FeSc_2S_4 belongs to the rare class of spin-orbital liquids. MnSc_2S_4 is a spin liquid for temperatures T > T_N \approx 2 K.

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