RANDOM-EXCHANGE DISORDER IN THE SPIN-1/2 XXZ CHAIN

被引：24

作者：

HAAS, S ^{[1
]}

RIERA, J ^{[1
]}

DAGOTTO, E ^{[1
]}

机构：

[1] FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.48.13174

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The one-dimensional XXZ model is studied in the presence of disorder in the Heisenberg exchange integral. Recent predictions obtained from renormalization-group calculations are investigated numerically using a Lanczos algorithm on chains of up to 18 sites. It is found that in the presence of strong X-Y-symmetric random-exchange couplings, a ''random singlet'' phase with quasi-long-range order in the spin-spin correlations persists. As the planar anisotropy is varied, the full zero-temperature phase diagram is obtained and compared with predictions of Doty and Fisher [Phys. Rev. B 45, 2167 (1992)]. In addition, we observed a novel reentrant transition of the ordered phases when exchange disorder is included.

引用

页码：13174 / 13177

页数：4

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