Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets I
TT 8.6: Vortrag
Montag, 31. März 2014, 10:45–11:00, HSZ 304
Novel magnetism in the spin-orbit driven Mott insulator Ba2YIrO6 — •Tusharkanti Dey1, Andrey Maljuk1, Olga Kataeva1,2, Frank Steckel1, Daniel Gruner1, Tobias Ritschel1, Christian G. F. Blum1, Anja U. B. Wolter1, Jochen Geck1, Christian Hess1,3, Sabine Wurmehl1,4, and Bernd Büchner1,4 — 1Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany — 2Kazan Federal University, Kremlevskaya str. 18, 420008, Kazan, Russia — 3Center for Transport and Devices of Emergent Materials, TU Dresden, 01069 Dresden, Germany — 4Institute for Solid State Physics, Dresden Technical University, TU-Dresden, 01062 Dresden, Germany
Single crystals of Ba2YIrO6 were synthesized for the first time. The material crystalizes in cubic double perovskite structure. Here the only magnetic ion Ir is expected to be in +5 oxidation state with 5d4 electronic configuration. Instead of the expected weak Van Vleck-type magnetism [1], we found Ba2YIrO6 is paramagnetic in the temperature range 2-300K. Curie-Weiss fitting (30-300K) of susceptibility data gives a Weiss constant θCW=-15K (AF) but no magnetic ordering is found down to 1.8K. Our study suggests that Ba2YIrO6 is a spin-orbit driven Mott insulator with highly frustrated magnetic interactions originating from the face centered cubic (FCC) lattice formed by the Ir moments. In this presentation, details of crystal growth along with structural, magnetic, thermal and electrical transport measurement results will be discussed.
G. Khaliullin, Phys. Rev. Lett. 111 (2013) 197201