Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4
TT 49.7: Vortrag
Freitag, 30. März 2012, 11:15–11:30, H 3005
Unconventional magnetic ordering in Spin-orbit Mott insulator with Honeycomb lattice — •Soham Manni1, Yogesh Singh2, and Philipp Gegenwart1 — 1I. Physikalisches Institut, Georg-August-Universitaet Goettingen, Goettingen, Germany — 2IISER Mohali, Mohali, India
Iridates have recently attracted much attention due to a novel Seff=1/2 Mott insulating state, driven by the interplay of moderate electronic correlations with strong spin-orbit coupling. We focus on A2IrO3 (A=Na,Li) which is a layered system with Ir moments sitting on a Honeycomb lattice and study their magnetic properties [1,2]. The temperature dependence of the susceptibility indicates a dominating antiferromagnetic exchange interaction with ΘW=−116 K and −33 K for the Na- and Ir system, respectively, while TN=15 K for both materials. Resonant X-ray scattering for the former system indicates an unconventional most likely zig-zag magnetic structure [3]. We discuss the results with respect to recent theoretical predictions for the Heisenberg-Kitaev model, including magnetic exchange beyond next-neighbor couplings and also present first results on the related Li2RhO3 system.
Work supported by the AvH foundation and the Erasmus Mundus EURINDIA project.
[1] Y. Singh and P. Gegenwart, Phys. Rev. B 82, 064412 (2010).
[2] Y. Singh, S. Manni, P. Gegenwart, arXiv:1106.0429.
[3] X. Liu et al., Phys. Rev. B 83, 220403(R) (2011).