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Persistent Paramagnons Deep in the Metallic Phase of<sub>Sr2−x</sub><sub>Lax</sub><sub>IrO4</sub>
Gretarsson, H.,Sung, N. H.,Porras, J.,Bertinshaw, J.,Dietl, C.,Bruin, Jan A. N.,Bangura, A. F.,Kim, Y. K.,Dinnebier, R.,Kim, Jungho,Al-Zein, A.,Moretti Sala, M.,Krisch, M.,Le Tacon, M.,Keimer, B.,Kim, American Physical Society 2016 Physical Review Letters Vol.117 No.10
Hozoi, L.,Gretarsson, H.,Clancy, J. P.,Jeon, B.-G.,Lee, B.,Kim, K. H.,Yushankhai, V.,Fulde, Peter,Casa, D.,Gog, T.,Kim, Jungho,Said, A. H.,Upton, M. H.,Kim, Young-June,van den Brink, Jeroen American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.89 No.11
In the search for topological phases in correlated electron systems, materials with 5d transition-metal ions, in particular the iridium-based pyrochlores A2Ir2O7, provide fertile grounds. Several topological states have been predicted but the actual realization of such states is believed to critically depend on the strength of local potentials arising from distortions of the IrO6 cages. We test this hypothesis by measuring with resonant inelastic x-ray scattering the electronic level splittings in the A = Y, Eu systems, which we show to agree very well with ab initio quantum chemistry electronic-structure calculations for the series of materials with A = Sm, Eu, Lu, and Y. We find, however, that the primary source for quenching the spin-orbit interaction is not a distortion of the IrO6 octahedra but longer-range lattice anisotropies which inevitably break the local cubic symmetry.