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TT: Tiefe Temperaturen

TT 21: Symposium Frustrated Systems

TT 21.7: Fachvortrag

Montag, 7. März 2005, 16:45–17:10, TU H104

Geometric Frustration in Thiospinels — •J. Hemberger, R. Fichtl, P. Lunkenheimer, V. Tsurkan, H.-A. Krug von Nidda, V. Fritsch, E.-W. Scheidt, N. Büttgen, A. Krimmel und A. Loidl — Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg

The normal cubic spinel systems AB₂S₄ (A =Cd, Fe, Mn and B = Sc, Cr) exhibit a wide range of exceptional ground state properties, depending on the appropriate choice of A- and B-site ions. The different scenarios reach from spin- and spin-orbital liquid behavior in the case of nonmagnetic B-sites (Sc) to ferrimagnetic and orbitally ordered or glassy states in the Cr-systems. Finally, even multiferroic behavior, namely the coexistence of ferromagnetism and relaxor ferroelectricity can be detected for the CdCr₂S₄. In all compounds frustration in the magnetic, orbital, and as well in the structural sector dominates the interplay of the microscopic degrees of freedom and the corresponding order phenomena.