Pati, S and Chitra, R and Sen, D and Krishnamurthy, HR and Ramasesha, S (1996) Phase diagram of the spin-one Heisenberg system with dimerization and frustration. In: Europhysics Letters, 33 (9). pp. 707-712.
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We use the density matrix renormalization group method to study the groundstate "phase" diagram and some low-energy properties of an antiferromagnetic spin-1 chain with a next-nearest-neighbour exchange $J_2$ and an alternation \delta of the nearest-neighbour exchanges. We find a line running from a gapless point at $(J_2\delta) = (0,0.25\pm 0.01)$ up to a "gapless" point at $(0.73\pm 0.005,0)$ such that the open-chain ground state is fourfold degenerate below the line and is unique above it. A disorder line $2J_2 +\delta=1$ runs from $\delta =1$ to about $\delta = 0.136$. To the left of this line, the peak in the structure factor S(q) is at \pi, while to the right of the line, it is at less than \pi.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to EDP Sciences.|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Centre for Theoretical Studies
Division of Physical & Mathematical Sciences > Physics
|Date Deposited:||01 Dec 2006|
|Last Modified:||19 Sep 2010 04:33|
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