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

S. Pati; R. Chitra; D. Sen; H. R. Krishnamurthy; S. Ramasesha

doi:10.1209/epl/i1996-00403-3

All issues

Volume 33 / No 9 (March III 1996)

Europhys. Lett., 33 9 (1996) 707-712

Abstract

Issue		Europhys. Lett. Volume 33, Number 9, March III 1996


Page(s)		707 - 712
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1996-00403-3
Published online		01 September 2002

Europhys. Lett., 33 (9), pp. 707-712 (1996)

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

S. Pati¹, R. Chitra², D. Sen³^,4, H. R. Krishnamurthy²^,4 and S. Ramasesha¹^,4

¹ Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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

Received: 15 September 1995
Accepted: 29 January 1996

Abstract

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 $(J_2 , \delta) = (0,0.25 \pm 0.01)$ 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 $2 J_2 + \delta = 1$ 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 $\pi$ .

PACS: 75.10.Jm – Quantized spin models / 75.50.Ee – Antiferromagnetics

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