Abstract
In order to clarify changes in the electronic structures, especially Fe partial density of states (DOS), of Li2Fe1−xMnxP2O7 with Mn substitution, we have performed x-ray absorption spectroscopy and resonant photoemission spectroscopy (RPES) experiments for Li2Fe1−xMnxP2O7. Using RPES teqniques, we have succeeded in extracting the Fe2+ partial DOS. We have found the systematic shift to higher binding energy and broadening of Fe 3d t2g down-spin states accompanying with the Mn substitution. The peak shift of the Fe 3d t2g down-spin states is matched very well to the change of Fe3+/Fe2+ redox potential, suggesting that the origin of high Fe3+/Fe2+ redox potential in Li2Fe1−xMnxP2O7 is the shift of the Fe 3d t2g down-spin states to the higher binding energy with Mn substitution.
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