Abstract
We studied the electronic structure of the Sr 3Fe 2O 7 compound using X-ray photoelectron spectroscopy (XPS). The charge-transfer satellites in the Fe 2p XPS spectra were analyzed using standard cluster model calculations. The analysis indicates that Sr 3Fe 2O 7 is in the negative charge-transfer regime, and that the ground state is dominated by the 3 d 5 L configuration (where L denotes an O 2p hole in the oxygen band). These results are similar to those found in the related SrFeO 3 and Sr 2FeO 4 compounds. The band gap of the Sr 3Fe 2O 7 compound is split off by the relatively large value of the p–d transfer integral T σ. The lowest lying excitations are 3 d 5 L +3 d 5 L →3 d 5+3 d 5 L 2 and consequently the band gap is of the p–p type. The band gap in the Sr n+1 Fe n O 3 n+1 series can be understood taking into account the trend in the O 2p bandwidths.
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