Resonant Photoemission Spectroscopy of Layered Triangular Lattices Ag2$M$O2 ($M$ = Ni and Mn): Evidence for $M$ 3d States at Fermi Level

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We report on the soft X-ray photoemission and absorption spectroscopy of Ag2NiO2 and Ag2MnO2, which consist of alternate stacks of (Ag2)+ and ($M$O2)- layers. The core-level photoemission and absorption spectra indicate mainly trivalent Ni3+ in Ag2NiO2, and trivalent Mn3+ with an admixture of Mn2+ states in Ag2MnO2. The $M$ 2p–3d resonant photoemission clearly shows that the density of states at the Fermi level includes the $M$ 3d character in both compounds. The results indicate that the Ni 3d and Mn 3d states at the Fermi level are responsible for the significant mass enhancement of carriers, as seen in the transport properties of Ag2NiO2 and Ag2MnO2.
2010-02-15