First-order spin-Peierls transition in S=1 antiferromagnetic Heisenberg chains

被引：3

作者：

Onishi, H

Miyashita, S

机构：

[1] Univ Tokyo, Grad Sch Engn, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[2] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2002年 / 63卷 / 6-8期

关键词：

magnetic materials; magnetic properties; phase transitions;

D O I：

10.1016/S0022-3697(02)00089-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We investigate a one-dimensional S = 1 antiferromagnetic Heisenberg model coupled to a lattice distortion by a quantum Monte Carlo method. The instability to a dimerized chain depends on the value of the spin-phonon coupling, unlike the case of S = 1/2. We find the first-order transition between the uniform Haldane state and the dimerized state. Two non-magnetic states coexist in the chain and a domain-wall structure is observed. In the coexistent state, we find that the length of the uniform Haldane region shrinks, which causes an asymmetrical bond distortion in the dimerized region. (C) 2002 Elsevier Science Ltd. All rights reserved.

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页码：1451 / 1454

页数：4

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