Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Magnetic Heuslers, Half-Metals and Oxides II (organized by MA)
TT 24.11: Vortrag
Montag, 31. März 2014, 18:15–18:30, BEY 118
Effect of high pressures synthesis on Ba3YIr2O9 — •Hannes Stummer, Tusharkanti Dey, Sabine Wurmehl, and Bernd Büchner — Leibniz-Institute for Solid State and Materials Research Dresden, Germany
The emergent field of Iridium oxide based materials recently came into focus due to their variety of interesting physical properties, specifically the new and unknown combinations of magnetic properties with interesting ground states [1]. These fascinating phenomena are induced by interaction of large Spin-Orbit-Coupling of the 5d transition metal and the onsite Coulomb energy U. Recent investigations of the Iridate Ba3YIr2O9 show that sample grown under normal pressure crystallize in a hexagonal structure and exhibit magnetic ordering below 4 K [2]. The crystal structure is transformed to a cubic double perovskite configuration (stable at ambient pressure), when treated at 8 GPa pressure. In this cubic double perovskite phase the magnetic ordering is suppressed. A possible spin-orbit driven spin liquid ground state is proposed for the high pressure perovskite structure [3]. We will present recent results about the systematic high pressure synthesis of Ba3YIr2O9 samples grown under different growth pressure in a Multi-Anvil assembly.The main focus will be on the measurements of structural and magnetic properties depending on the applied pressure during the synthesis process. [1] B. J. Kim et al., Phys. Rev. Lett. 101, 076402 (2008) [2] Y. Doi et al., J. Phys.: Condens. Matter 16, 2849 (2004) [3] T. Dey et al., Phys. Rev. B 88, 134425 (2013)