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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 56: Focus Session: Electronic Properties of Spin-Orbit Driven Oxides

TT 56.1: Invited Talk

Wednesday, April 2, 2014, 09:30–10:00, HSZ 03

Exotic Magnetism of Jeff=1/2 Iso-Spins in Complex Ir Oxides — •Hidenori Takagi — Department of Physics, University of Tokyo, Tokyo, Japan — Max Planck Institute for Solid State Research, Stuttgart, Germany

In 5d Iridium oxides, a large spin-orbit coupling of  0.5 eV, inherent to heavy 5d elements, is not small as compared with other relevant electronic parameters including Coulomb U, transfer t and crystal field splitting D, which gives rise to a variety of exotic magnetic ground states. In the layered perovskite Sr2IrO4, spin-orbital Mott state with Jeff=1/2 is realized due to the novel interplay of those energy scales [1, 2]. Despite the strong entanglement of spin and orbital degrees of freedom, surprisingly isotropic, two-dimensional Heisenberg character of Jeff=1/2 iso-spins was observed in Sr2IrO4 with 180 deg Ir-O-Ir bonds, by the recent resonant magnetic x-ray diffuse scattering and the magnetic susceptibility measurements [3]. Complex Na-Ir oxides with honeycomb and more recently identified hyper-honeycomb lattices, where 90 deg Ir-O-Ir bonds are realized, are candidates for Kitaev spin liquid. Such exotic magnetism was recently shown to be tailored using super-lattice structure [4]. In this talk, we review these phases of interest.
B. J. Kim et al., Phys. Rev. Lett. 101, 076402 (2008)
B. J. Kim et al., Science 323, 1329 (2009)
S. Fujiyama et al. , Phys. Rev. Lett. 108, 247212 (2012)
J. Matsuno et al., submitted.

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