Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.22: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Relation between crystal structure, magnetism and electronic properties in layered ruthenates — •Johanna Brand1, Anna Silex1, Karsten Binder1, Yvan Sidis2, Arsen Gukasov2, Beatrice Gillon2, Satoru Nakatsuji3, Naoki Kikugawa4, Andrew Mackenzie4, Fumihiko Nakamura5, and Markus Braden1 — 1II. Physik, Uni Köln — 2LLB, Saclay — 3ISSP, Tokio — 4Univ. of St. Andrews — 5ADSM, Hiroshima
Layered ruthenates exhibit a close coupling between crystal structure and magnetic and electronic properties, which strengthens the interest in these materials arising from the superconductivity in Sr2RuO4 and Ca2RuO4. By substituting Sr through isovalent Ca in Ca2RuO4 one tunes the system from the superconductor into a highly anomalous metal with heavy-fermion like properties and finally into an antiferromagnetic Mott insulator. The MIT in Ca2RuO4 can not only be induced by Sr-doping, heating and pressure but also by the application of an electric field. A part of the sample transforms into the metallic phase under the application of moderate electric fields, this phase is characterized by a longer c-lattice parameter and it can be cooled far below room temperature when a finite current density is maintained. At low temperature there is coexistence of the metallic phase and the insulating phase. Doping Ca3Ru2O7 with Ti significantly stabilizes a weakly non-metallic phase as seen both in the transition temperature and in the resistivity jump. This effect is especially prominent at a substitution of 10