Abstract
Electronic structures of La-dopedBa2FeMoO6 double perovskite oxides have been investigated using photoemissionspectroscopy and soft x-ray absorption spectroscopy. The ground states ofBa2−xLaxFeMoO6 are foundto be in the Fe2+–Fe3+ mixed-valent states and the Fe valence state increases toward3+ with increasingx. The statesclose to EF consist of the degenerate Mo–Fe states. The LSDA +U calculations for Ba2−xLaxFeMoO6 (x = 0,1) show a larger occupied bandwidth of the Mo states for x = 1 than forx = 0, which is consistentwith the higher TC value predicted in a type of the double exchange mechanism.
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