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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.56: Poster

Wednesday, March 28, 2007, 14:00–17:45, Poster A

Mean-field theory of quadrupolar ordering in YbRu₂Si₂ — •Tetsuya Takimoto and Peter Thalmeier — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

We study theoretically quadrupolar ordering in YbRu₂Si₂. At first, we construct an effective Hamiltonian with two Kramers doublets, which consists of CEF, Zeeman, and inter-site interaction terms. In the inter-site term, there are interactions between multipoles which are classified according to the irreducible representations of the point group. Applying mean-field theory, we calculate the H-T phase diagram, order parameters, and the magnetic susceptibility. Comparing our results with experimental data, we identify the type of quadrupolar ordering observed in YbRu₂Si₂ as ferro-ordering of quadrupole O₂².