Spin and orbital frustration in MnSc2S4 and FeSc2S4

Crystal structure, magnetic susceptibility, and specific heat were measured in the normal cubic spinel compounds MnSc2S4 and FeSc2S4. Down to the lowest temperatures, both compounds remain cubic and reveal strong magnetic frustration. Specifically the Fe compound is characterized by a Curie-Weiss (C...

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Bibliographic Details
Published in:Physical review letters 2004-03, Vol.92 (11), p.116401.1-116401.4
Main Authors: FRITSCH, V, HEMBERGER, J, BÜTTGEN, N, SCHEIDT, E.-W, KRUG VON NIDDA, H.-A, LOIDL, A, TSURKAN, V
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical-point effects, specific heats, short-range order
Exact sciences and technology
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Physics
Saturation moments and magnetic susceptibilities
Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
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Summary:Crystal structure, magnetic susceptibility, and specific heat were measured in the normal cubic spinel compounds MnSc2S4 and FeSc2S4. Down to the lowest temperatures, both compounds remain cubic and reveal strong magnetic frustration. Specifically the Fe compound is characterized by a Curie-Weiss (CW) temperature ThetaCW = -45 K and does not show any indications of order down to 50 mK. In addition, the Jahn-Teller ion Fe2+ is orbitally frustrated. Hence, FeSc2S4 belongs to the rare class of spin-orbital liquids. MnSc2S4 is a spin liquid for temperatures T>TN approximately 2 K.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.116401