Interplay of frustration, magnetism, charge ordering, and covalency in the ionic Hubbard model for Na0.5 CoO2

Merino, Jaime, Powell, B. J. and McKenzie, Ross H. (2009) Interplay of frustration, magnetism, charge ordering, and covalency in the ionic Hubbard model for Na0.5 CoO2. Physical Review B, 79 16: 161103-1-161103-4. doi:10.1103/PhysRevB.79.161103

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Author Merino, Jaime
Powell, B. J.
McKenzie, Ross H.
Title Interplay of frustration, magnetism, charge ordering, and covalency in the ionic Hubbard model for Na0.5 CoO2
Formatted title
Interplay of frustration, magnetism, charge ordering, and covalency in the ionic Hubbard model for Na0.5CoO2
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2009-04-28
Year available 2009
Sub-type Article (original research)
DOI 10.1103/PhysRevB.79.161103
Open Access Status File (Publisher version)
Volume 79
Issue 16
Start page 161103-1
End page 161103-4
Total pages 4
Editor P. D. Adams
Place of publication United States of America
Publisher American Physical Society
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
0204 Condensed Matter Physics
Abstract 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.
Keyword charge exchange
transition-metal compounds
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CTQ2005-09385-C03-03
CTQ2008-06720-C02-02
DP0878523
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
School of Mathematics and Physics
2010 Higher Education Research Data Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 03 Sep 2009, 18:08:27 EST by Mr Andrew Martlew on behalf of Physics