X-ray Absorption Spectroscopy Study of the Effect of Rh doping in Sr(2)IrO(4)

We investigate the effect of Rh doping in Sr(2)IrO(4) using X-ray absorption spectroscopy (XAS). We observed appearance of new electron-addition states with increasing Rh concentration (x in Sr(2)Ir(1−x)Rh(x)O(4)) in accordance with the concept of hole doping. The intensity of the hole-induced state...

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Detalles Bibliográficos
Autores principales: Sohn, C. H., Cho, Deok-Yong, Kuo, C.-T., Sandilands, L. J., Qi, T. F., Cao, G., Noh, T. W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4812298/
https://www.ncbi.nlm.nih.gov/pubmed/27025538
http://dx.doi.org/10.1038/srep23856
Descripción
Sumario:We investigate the effect of Rh doping in Sr(2)IrO(4) using X-ray absorption spectroscopy (XAS). We observed appearance of new electron-addition states with increasing Rh concentration (x in Sr(2)Ir(1−x)Rh(x)O(4)) 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 J(eff) = 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 J(eff) = 1/2)–(O 2p) orbital hybridisation in the in-planar Rh-O-Ir bond networks.

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