Spin and orbital frustration in MnSc₂S₄ and FeSc₂S₄

V. Fritsch , J. Hemberger , N. Buettgen , E. W. Scheidt , H. A. Krug von Nidda , A. Loidl , V. Tsurkan

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classification ❄️ cond-mat.str-el cond-mat.mtrl-sci

keywords fescmnsccompoundscubicdownfrustrationmagneticspin

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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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Spin and orbital frustration in MnSc₂S₄ and FeSc₂S₄

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