[en] Synchrotron x-ray diffraction and electrical resistivity were used to probe the electronic phase transition in two strained La_1/3Sr_2/3FeO₃ films on (001) SrTiO₃ substrates, one nominally stoichiometric and one with a higher concentration of oxygen vacancies. We present evidence that oxygen vacancies inhibit the size of charge ordered domains and reduce the abruptness of the phase transition. Additionally, the correlation lengths measured from (4/3 4/3 4/3) peaks, arising from charge disproportionation, increase rapidly across the transition, suggesting that the resistivity increase at the transition temperature is caused by the nucleation and growth of charge ordered domains

[en] The electronic structure for the conduction bands of both hexagonal and orthorhombic LuFeO_3 thin films have been measured using x-ray absorption spectroscopy at oxygen K (O K) edge. Dramatic differences in both the spectral features and the linear dichroism are observed. These differences in the spectra can be explained using the differences in crystal field splitting of the metal (Fe and Lu) electronic states and the differences in O 2p-Fe 3d and O 2p-Lu 5d hybridizations. While the oxidation states have not changed, the spectra are sensitive to the changes in the local environments of the Fe"3"+ and Lu"3"+ sites in the hexagonal and orthorhombic structures. Using the crystal-field splitting and the hybridizations that are extracted from the measured electronic structures and the structural distortion information, we derived the occupancies of the spin minority states in Fe"3"+, which are non-zero and uneven. The single ion anisotropy on Fe"3"+ sites is found to originate from these uneven occupancies of the spin minority states via spin–orbit coupling in LuFeO_3. (paper)