Journal
PHYSICAL REVIEW B
Volume 73, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.165117
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Electronic structure calculations were carried out on the compound GdBaCo2O5.5. The electronic structure variation with a change in the spin state of the Co3+ ion in an octahedral environment has been studied. All the insulating phases are described and possible scenarios for the metallic ones are presented. Orbital ordering is shown to take place and the electronic structure leading to it is determined. The Ising-type anisotropy shown experimentally can be predicted. Also, big unquenched orbital angular momenta are calculated and their origin is described.
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