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X-ray Absorption Spectroscopy Study of the Effect of Rh doping in Sr2IrO4.

Sohn, C H; Cho, Deok-Yong; Kuo, C-T; Sandilands, L J; Qi, T F; Cao, G; Noh, T W.
Sci Rep; 6: 23856, 2016 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-27025538
We investigate the effect of Rh doping in Sr2IrO4 using X-ray absorption spectroscopy (XAS). We observed appearance of new electron-addition states with increasing Rh concentration (x in Sr2Ir1-xRhxO4) in accordance with the concept of hole doping. The intensity of the hole-induced state is however weak, suggesting weakness of charge transfer (CT) effect and Mott insulating ground states. Also, Ir Jeff = 1/2 upper Hubbard band shifts to lower energy as x increases up to x = 0.23. Combined with optical spectroscopy, these results suggest a hybridisation-related mechanism, in which Rh doping can weaken the (Ir Jeff = 1/2)-(O 2p) orbital hybridisation in the in-planar Rh-O-Ir bond networks.
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