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29 March 2024
 
  » arxiv » cond-mat/0403718

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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
AbstractMotivated 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
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