Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets I

TT 8.6: Talk

Monday, March 31, 2014, 10:45–11:00, HSZ 304

Novel magnetism in the spin-orbit driven Mott insulator Ba₂YIrO₆ — •Tusharkanti Dey¹, Andrey Maljuk¹, Olga Kataeva^1,2, Frank Steckel¹, Daniel Gruner¹, Tobias Ritschel¹, Christian G. F. Blum¹, Anja U. B. Wolter¹, Jochen Geck¹, Christian Hess^1,3, Sabine Wurmehl^1,4, and Bernd Büchner^1,4 — 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 θ_CW=-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