A COUPLED-CLUSTER TREATMENT OF SPIN-1/2 SYSTEMS WITH NEAREST-NEIGHBOR AND NEXT-NEAREST-NEIGHBOR INTERACTIONS

被引：29

作者：

FARNELL, DJJ

PARKINSON, JB

机构：

[1] Dept. of Math., Univ. of Manchester, Inst. of Sci. and Technol.

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 28期

关键词：

D O I：

10.1088/0953-8984/6/28/024

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The coupled-cluster method of quantum many-body theory is applied to 1D and 2D spin-1/2 systems with nearest-neighbour and next-nearest-neighbour isotropic exchange. Several simple approximation schemes based on a Neel model state are investigated and are found to give satisfactory results in the antiferromagnetic regime. Results are given for the ground-state energy, the order parameter and the sublattice magnetization. We obtain evidence of a phase transition.

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页码：5521 / 5532

页数：12

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