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Synchrotron-Radiation Study of Valence States and Electronic Structures of \hbox {AgNi}_{1-{\rm x}}\hbox {Co}_{\rm x}\hbox {O}_{2} Delafossite Oxides

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11 Author(s)
Kang, J.-S. ; Phys. Dept., Catholic Univ. of Korea, Bucheon ; Lee, S.S. ; Lee, H.J. ; Kim, G.
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The electronic structures of AgNi1-xCoxO2 (0 les x les 1) delafossite oxides have been investigated by employing photoemission spectroscopy (PES) and X-ray absorption spectroscopy (XAS) in the soft X-ray regime of synchrotron radiation. The Ag 3d core-level PES spectra shift toward the higher binding energy with increasing x, in agreement with the metallic nature for low values of x and the insulating nature for high values of x in AgNi1-xCoxO2 . Further, the Ag 3d core-level PES spectra become more asymmetric with decreasing x, which reflects the larger number of electron-hole pairs in the Ni-rich regime. Valence-band PES spectra reveal that the band width of the occupied Ni 3d states is broader than that of the Co 3d states, implying the larger Ni 3d-O 2p hybridization than the Co 3d-O 2p hybridization. The Co and Ni 2p XAS spectra show that Co ions are in the low-spin Co3+ states for all x, while Ni ions are in the Ni2+-Ni3+ mixed-valent states. The Ni3+ component increases with x.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 6 )