Abstract
We present a systematic study of the perovskite-related system La2-xSrxCu1-yRuyO4-delta using Cu L-2,L-3, Ru L-2,L-3, and O K X-ray absorption spectroscopy (XAS), magnetic and electrical measurements. This system can be regarded as hole-doped via substitution of La by Sr and to be electron-doped via substitution of Ru by Cu, and
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