Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 3 (jointly with MA)
TT 30.10: Vortrag
Dienstag, 17. März 2015, 12:00–12:15, H 0110
Relation between structural evolution and effective Ir moments upon applied pressure during synthesis in Ba3YIr2O9 — •Hannes Stummer, Tusharkanti Dey, Sabine Wurmehl, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research Dresden, Germany.
The intensively investigated material class of Iridium oxide based materials provides a variety of new and unknown combinations of magnetic properties with interesting novel or exotic ground states [1]. These Iridate compounds often appear in a perovskite type structure or a related derivative which are very favorable for crystal structure modifications under high pressure. High pressure synthesis therefore can be used to tune or change the magnetic properties appearing under normal pressure [2]. The Iridate Ba3YIr2O9 crystallizes under ambient pressure synthesis in a hexagonal structure and exhibits magnetic ordering below 4 K. A synthesis pressure of 8 GPa advances the material to form a cubic double perovskite structure which is (meta-)stable at ambient pressure. For this high pressure configuration the magnetic ordering is suppressed [3]. We will present our recent results about the systematic high pressure synthesis and characterization of Ba3YIr2O9 samples grown under different growth pressure. The main focus will be on the correlation between structural and magnetic properties depending on the applied pressure during the synthesis process.
[1] B. J. Kim et al., PRL 101, 076402 (2008).
[2] J.G. Cheng et al., PRB 88, 205114 (2013).
[3] T. Dey et al., Phys. Rev. B 88, 134425 (2013).