Dimensionality Driven Spin-Flop Transition in Layered Iridates

Kim, J. W.; Choi, Y.; Kim, J.; Mitchell, J. F.; Jackeli, G.; Daghofer, M.; van den Brink, J.; Khaliullin, G.; Kim, B. J.

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Dimensionality Driven Spin-Flop Transition in Layered Iridates

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Daghofer, M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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van den Brink, J.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin, G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kim, J. W., Choi, Y., Kim, J., Mitchell, J. F., Jackeli, G., Daghofer, M., et al. (2012). Dimensionality Driven Spin-Flop Transition in Layered Iridates. Physical Review Letters, 109(3): 037204.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C3EF-9

Abstract

Using resonant x-ray diffraction, we observe an easy c-axis collinear antiferromagnetic structure for the bilayer Sr3Ir2O7, a significant contrast to the single layer Sr2IrO4 with in-plane canted moments. Based on a microscopic model Hamiltonian, we show that the observed spin-flop transition as a function of number of IrO2 layers is due to strong competition among intra-and interlayer bond-directional pseudodipolar interactions of the spin-orbit entangled J(eff) = 1/2 moments. With this we unravel the origin of anisotropic exchange interactions in a Mott insulator in the strong spin-orbit coupling regime, which holds the key to the various types of unconventional magnetism proposed in 5d transition metal oxides.