Phys. Rev. B 79, 161103(R) (2009) [4 pages]Interplay of frustration, magnetism, charge ordering, and covalency in the ionic Hubbard model for Na0.5CoO2
We investigate the ionic Hubbard model on a triangular lattice at three-quarters filling. This model displays a subtle interplay between metallic and insulating phases and between charge and magnetic orders. We find crossovers among Mott, charge transfer and covalent insulators, and magnetic order with large moments that persist even when the charge transfer is weak. Our theoretical results are consistent with experiments on A0.5CoO2 (A=K,Na) and identify these materials as correlated covalent insulators. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.161103
DOI:
10.1103/PhysRevB.79.161103
PACS:
71.10.Fd, 71.15.−m, 71.27.+a
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.