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Phase diagram of the spin-one Heisenberg system with dimerization and frustration

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
Publication: Europhysics Letters
Publisher: EPD Sciences
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 (Ceased to exist at the end of 2003)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Dec 2006
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ac.in/id/eprint/9080

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