Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.1: Poster
Mittwoch, 28. März 2007, 14:00–17:45, Poster A
Neutron Scattering and X-ray Diffraction on HoInCu4 — •Veronika Fritsch1,3, Svilen Bobev2, John L. Sarrao3, Uwe Amann4,5, and Oliver Stockert6 — 1Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany — 2Department of Chemistry, University of Delaware, Newark, DE 19716, USA — 3Los Alamos National Laboratory, Los Alamos, NM 87545, USA — 4BENSC, HMI, 14109 Berlin, Germany — 5Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany — 6MPI-CPfS, 01187 Dresden, Germany
The ternary rare-earth compounds RInCu4 (R = Gd, Dy, Ho and Er) show strong indications of frustration as manifested by measurements of magnetic susceptibility and specific heat. The crystal structure, in which the rare-earth ions occupy a face-centered cubic lattice, suggests the presence of geometrical frustration. In order to get further insight into the crystal and magnetic structure we performed X-ray diffraction measurements on flux-grown single crystals and neutron diffraction measurements on powder of HoInCu4. Single crystal X-ray diffraction data confirmed that the samples are fully ordered, all atoms occupy crystallographically independent sites and crystallize in the cubic AuBe5-structure. HoInCu4 exhibits magnetic order below TN = 0.75 K as evidenced by heat capacity measurements. Neutron diffraction patterns were taken above and below the Néel temperature, indicating a commensurate magnetic structure with a propagation vector τ = (1 1/2 0) below TN as well as strong magnetic correlations in the paramagnetic state as expected in systems with strong frustration.