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Science 16 November 2007:
Vol. 318. no. 5853, p. 1033
DOI: 10.1126/science.318.5853.1033b
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This Week in Science

The rich phase diagram of the transition metal oxides and the recent demonstrations of patterning and tuning the interface region, which can lead to unexpected phenomena such as the quantum Hall effect and superconductivity, have generated much interest in developing oxide electronics. Chakhalian et al. (p. 1114, published online 11 October; see the Perspective by Dagotto) now report on an x-ray spectroscopy study on the interface between high-temperature superconducting (Y,Ca)Ba2Cu3O7 and metallic La0.66Ca0.33MnO3 with surface-sensitive as well as bulk-sensitive configurations. Charge transfers from the Mn oxide layer to the Cu oxide layer, but does not simply move into the dz2-x2 orbitals of Cu in a rigid manner. Instead, orbital reconstruction occurs that involves population of the 3z2-12 orbital. Calculations show that the orbital reconstruction is consistent with a scenario in which the Cu atom forms a covalent bond with the Mn atom.




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