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Order and disorder in the triangular-lattice t-J-V model at 2/3 electron density | W. Zheng
; J. Oitmaa
; C.J. Hamer
; R.R.P. Singh
; | Date: |
30 Mar 2004 | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | Abstract: | Motivated by the recent discovery of superconductivity in Na$_x$CoO$_2cdot y$H$_2$O, we use series expansion methods and cluster mean-field theory to study spontaneous charge order, Neel order, ferromagnetic order, dimer order and phase-separation in the triangular-lattice t-J-V model at 2/3 electron density. We find that for t<0, the charge ordered state, with electrons preferentially occupying a honeycomb lattice, is very robust. Quite surprisingly, hopping to the third sublattice can even enhance Neel order. At large negative t and small V, the Nagaoka ferromagnetic state is obtained. For large positive t, charge and Neel order vanish below a critical V, giving rise to an itinerant antiferromagnetically correlated state. | Source: | arXiv, cond-mat/0403718 | Services: | Forum | Review | PDF | Favorites |
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