X-Ray Spectroscopic Studies of A-Site Ordered Perovskite LaMn3B4O12(B=V, Cr)

We investigated the electronic structure of LaMn3B4O12 (LMVO) and LaMn3B4O12 (LMCO) by X-ray absorption spectroscopy (XAS) and resonant X-ray emission spectroscopy (RXES) measurements around Mn 2p edges. The Mn 2p-XAS spectra showed that the Mn valence is trivalent for LMCO and divalent for LMVO. These results indicate that the A'-site can accommodate not only Jahn-Teller ions but also non-Jahn-Teller ions. The Mn 2p-RXES spectra showed the difference of the hybridization between Mn-3d and O-2p orbitals. According to theoretical calculation results, LMCO is candidates for the negative charge transfer energy compound.