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Abstract
We have investigated the electronic structure of a double perovskite Ca 2FeReO 6 using photoemission spectroscopy and LDA + U band-structure calculations. Small spectral weight at the Fermi level observed above the metal–insulator transition temperature, gradually disappears with decreasing T, forming a small (≤50 meV) energy gap. To reproduce this small energy gap, we require a very large effective U ( U eff) for Re (4 eV) in addition to U eff of 4 eV for Fe. From simple calculations in terms of the ionic radii, we demonstrate that the Fe–Re bandwidth is smaller than that of Fe–Mo in Ca 2FeMoO 6, which should yield a strong electron correlation in the Re 5d bands.
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