Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Correlated Electrons: Spin Systems, Itinerant Magnets 1

TT 7.3: Vortrag

Montag, 11. März 2013, 10:00–10:15, H19

Doping effects on Honeycomb lattice iridate A₂IrO₃ (A=Na,Li) — •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 S_eff=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 [1,2]. Theoretically, this system has been proposed as solid-state realization of the Heisenberg-Kitaev(HK)model. Recently there are many fascinating predictions for doping in A₂IrO₃ [3].

The temperature dependence of the susceptibility indicates a dominating antiferromagnetic exchange interaction with Θ_W=−125 K and −33 K for the Na- and Li- system, respectively, while T_N=15K for both materials. We discuss the effects of different dopings (iso- and non-isoelectronic) on the A-site and Cu-intercalation by investigation of their structural, electronic and magnetic properties. Different playgrounds like order-disorder effect and chemical pressure effect etc. will be discussed here.

Work supported by the Erasmus Mundus EURINDIA project.
[1] Y. Singh and P. Gegenwart, Phys. Rev. B 82, 064412 (2010)
Y. Singh, S. Manni, P. Gegenwart and others, PRL 108, 127203 (2012)
A. Vishwanath et.al. Phys. Rev. B 86, 085145 (2012).