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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.30: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Metal-insulator transitions in layered ruthenatesJohanna Brand1, •Anna Silex1, Olaf J. Schumann1, Michael Gottschlich1, Steven Price1, Navid Qureshi1, Paul Steffens1,2, Daniel Löwen1, Yvan Sidis3, Arsène Goukassov3, Beatrice Gillon3, Satoru Nakatsuji4, Jason Farrell5, Naoki Kikugawa5, Andrew Mackenzie5, Karin Schmalzl2, and Markus Braden11II. Physik, Uni Köln — 2ILL, Grenoble — 3LLB, Saclay — 4ISSP, Tokio, Japan — 5Univ. of St. Andrews, Scotland

Ca- and Sr-Ruthenates are far more interesting than the structural similarity with the cuprates initially suggested. By doping the single or double layer materials, many interesting phenomena are observed. Substituting Ti into Sr2RuO4 stabilizes a spin-density wave (SDW) phase that still is metallic, in which the static ordering corresponds to the dominating magnetic instability in pure Sr2RuO4. On the other hand, the doping of Ti into the double layer material Sr3Ru2O7 seems to induce a SDW type magnetic order with larger impact on the electronic properties. The SDW phase in Ti-doped Sr3Ru2O7 does not seem to be related with the magnetic instabilities of the parent phase. In both Sr-ruthenates the impact of the Ti-doping on the crystal structure is small and changes slightly across the magnetic transition. However, we find a strong influence of the Ti-substitution in Ti-doped Ca3Ru2O7 which significantly stabilizes a weakly non-metallic phase. This can be seen in the transition temperature and in the resistivity jump. A pronounced flattening of the lattice is discussed as a general feature accompanying the metal-insulator transition in layered ruthenates.

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