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  Cluster approach study of intersite electron correlations in pyrochlore and checkerboard lattices

Yushankhai, V., Fulde, P., & Thalmeier, P. (2005). Cluster approach study of intersite electron correlations in pyrochlore and checkerboard lattices. Physical Review B, 71, 245108-1-245108-8. doi:10.1103/PhysRevB.71.245108.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-2C9D-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-EAD2-9
Genre: Journal Article

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 Creators:
Yushankhai, V.1, Author              
Fulde, P.1, Author              
Thalmeier, P.2, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: To treat effects of electron correlations in geometrically frustrated pyrochlore and checkerboard lattices, an extended single-orbital Hubbard model with nearest-neighbor hopping ∼t and Coulomb repulsion ∼V is applied. Infinite on-site repulsion, U→∞, is assumed, thus double occupancies of sites are forbidden completely in the present study. A variational Gutzwiller-type approach is extended to examine correlations due to short-range V interaction and a cluster approximation is developed to evaluate a variational ground-state energy of the system. Obtained analytically in a special case of quarter band filling appropriate to LiV2O4, the resulting simple expression describes the ground-state energy in the regime of intermediate and strong coupling V. Like in the Brinkman-Rice theory based on the standard Gutzwiller approach to the Hubbard model, the mean value of the kinetic energy is shown to be reduced strongly as the coupling V approaches a critical value Vc. This finding may contribute to explaining the observed heavy fermion behavior in LiV2O4.

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Language(s): eng - English
 Dates: 2005-06-21
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 241710
DOI: 10.1103/PhysRevB.71.245108
 Degree: -

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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 71 Sequence Number: - Start / End Page: 245108-1 - 245108-8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008