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TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.32: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Pressure control of quantum magnets with heavy transition-metals — •Marian Blankenhorn1, Tomohiro Takayama2, Kentaro Kitagawa3, Carl Fürderer1, and Hidenori Takagi1,2,3 — 1University of Stuttgart, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3University of Tokyo, Tokyo, Japan
Recently, exotic quantum magnetism has been reported in 4d and 5d transition-metal oxides such as iridates, where the interplay of electron correlation and strong spin-orbit coupling leads to unconventional magnetic coupling. Such 4d and 5d oxides are regarded as weak Mott insulators produced by modest Coulomb interaction. We expect a pressure induced metal-insulator transition in a moderate pressure range, which may give rise to exotic metallic states and possible superconductivity at the critical point. One of the target materials is the 3-dimensional quantum spin liquid Na4Ir3O8, which comprises a hyper-kagome lattice of Ir4+-ions. Na4Ir3O8 is known to be tuned into a metal by carrier doping and thus we expect that Na4Ir3O8 can be driven into a metallic state by applying pressure. We also study honeycomb-based oxides, which are candidates for quantum spin liquids.
In order to apply high pressure up to 10 GPa, we use an opposed-anvil high pressure cell developed by Kitagawa et al. allowing electric transport measurements. We report preliminary pressure-studies on these heavy transition-metal quantum magnets and discuss the nature of exotic metallic states expected under high pressure.