Abstract
The pyrochlore iridate In$_2$Ir$_2$O$_7$ is a strong $J_{\mathrm{eff}} = 1/2$ Mott insulator with frustrated magnetism. Despite the large trigonal crystal field, a small admixture of $J_{\mathrm{eff}} = 3/2$ component in the $J_{\mathrm{eff}} = 1/2$ bands and a small splitting of $J_{\mathrm{eff}} = 3/2$ bands are observed as compared with other pyrochlore iridates A$_2$Ir$_2$O$_7$ (A: trivalent cation). We argue that the reduced inter-site hopping between the $J_{\mathrm{eff}} = 1/2$ and the $J_{\mathrm{eff}} = 3/2$ manifold plays a predominant role in the distinct behavior of In$_2$Ir$_2$O$_7$ compared with other A$_2$Ir$_2$O$_7$. The effect of the intersite hopping should not be dismissed in the local physics of spin-orbital-entangled $J_{\mathrm{eff}} = 1/2$ Mott insulators.
Highlights
1 2 bands is observed as compared with other pyrochlore iridates A2Ir2O7 (A = trivalent cation)
Transition-metal oxides containing 5d elements have been receiving attention in the search for novel electronic states generated by the interplay between moderate on-site Coulomb repulsion, U ∼ 2 eV, and strong spin-orbit coupling, λSOC ∼ 0.5 eV [1]
A2Ir2O7 crystallizes in a cubic structure with space group F d3m consisting of two interpenetrating pyrochlore networks of A and Ir cations
Summary
In-O bonds, plays a predominant role in the distinct behavior of In2Ir2O7 Such effect of the intersite hopping should not be dismissed local physics. A2Ir2O7 crystallizes in a cubic structure with space group F d3m consisting of two interpenetrating pyrochlore networks of A and Ir cations [Fig. 1(a)]. Their electronic ground states evolve with the ionic radius of the A cation [7,8]. With decreasing A size, namely, reducing the bandwidth, the system undergoes a metal-insulator transition [8] accompanied by a magnetic transition. Derived states [20,21]
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