Volume 33, Number 9, March III 1996
|Page(s)||707 - 712|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Phase diagram of the spin-one Heisenberg system with dimerization and frustration
Solid State and
Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012,
2 Physics Department, Indian Institute of Science - Bangalore 560012, India
3 Centre for Theoretical Studies, Indian Institute of Science - Bangalore 560012, India
4 Jawaharlal Nehru Centre for Advanced Scientific Research, Indian Institute of Science Campus - Bangalore 560012, India
Accepted: 29 January 1996
We use the density matrix renormalization group method to study the ground-state "phase" diagram and some low-energy properties of an antiferromagnetic spin-1 chain with a next-nearest-neighbour exchange J2 and an alternation δ of the nearest-neighbour exchanges. We find a line running from a gapless point at up to a "gapless" point at such that the open-chain ground state is fourfold degenerate below the line and is unique above it. A disorder line runs from to about . To the left of this line, the peak in the structure factor S(q) is at , while to the right of the line, it is at less than .
PACS: 75.10.Jm – Quantized spin models / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1996
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