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Local atomic configuration and Auger valence electron spectra in BiSrCaCuO single crystals

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6 Author(s)
Fujiwara, Y. ; Fac. of Eng. Sci., Osaka Univ., Japan ; Hirata, S. ; Nishikubo, M. ; Kobayashi, T.
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Bi2Sr2CaCu2Oy (2212) and Ca-doped Bi2Sr2CuOy (2201) single crystals were systematically investigated by Auger valence electron spectroscopy (AVES). In AVES measurements on two kinds of crystals, a drastic difference was observed in the spectral shape of Ca[2p,3p,3p] reflecting a difference in spin-orbit splitting induced by local atomic configuration in the vicinity of Ca atoms. Furthermore, a Ca[2p,3p,4s] spectrum appeared in both crystals, indicating that the real valence of Ca atoms deviates from +2 in the crystals. The results suggest that AVES is a promising probe for characterizing local atomic configuration and valence electron states of the constituent elements

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )