Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-09
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages with 3 figures; added references, changed Fig. 3
Scientific paper
The mixed diamond chain is a frustrated Heisenberg chain composed of successive diamond-shaped units with two kinds of spins of magnitudes S and S/2 (S: integer). Ratio $lambda$ of two exchange parameters controls the strength of frustration. With varying $lambda$, the Haldane state and several spin cluster states appear as the ground state. A spin cluster state is a tensor product of exact local eigenstates of cluster spins. We prove that a spin cluster state is the ground state in a finite interval of $lambda$. For S=1, we numerically determine the total phase diagram consisting of five phases.
Hida Kazuo
Suzuki Hidenori
Takano Ken'ichi
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