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We analyse the ground state phase diagrams of the charge orderings in narrow band materials using two effective models: (1) the spinless fermion model (t - W) with repulsive intersite interaction (W_{ij} > 0) and (2) the molecular crystal model with the coupling of electrons to intramolecular (crystal field) vibrations. We present results for the case of half filled bands for d = 2 square lattice. The calculations are performed within the (broken symmetry) Hartree-Fock approximation. The study takes into consideration the effects of frustrating next-nearest-neighbour hopping (t_2) on the charge ordered states in these systems. We focus on the two cases: (i) homogeneous phases and phase separations involving checkerboard charge ordering with the nesting vector Q= (π,π) only and (ii) homogeneous phases and phase separations involving two types of charge ordering: (a) checkerboard charge ordering with the nesting vector Q = (π,π), and (b) collinear (CL) charge ordering with Q = (0,π) or Q = (π,0).
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Pages
1042-1044
Physical description
Dates
published
2012-05
Contributors
author
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv121n5-6p15kz