EFFECTS OF PERTURBING SPINS ON THE PROPERTIES OF THE S=1/2 HEISENBERG-ANTIFERROMAGNET ON THE SQUARE LATTICE

被引：5

作者：

BETTS, DD ^{[1
]}

OITMAA, J ^{[1
]}

机构：

[1] UNIV NEW S WALES,SCH PHYS,KENSINGTON,NSW 2033,AUSTRALIA

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.48.10602

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effects on ground-state properties of an extra spin coupled ferromagnetically or antiferromagnetically to the S = 1/2 Heisenberg antiferromagnet have been calculated for lattices of N= 8, 10, 16, 18, and 20 sites. For an antiferromagnetically coupled extra spin all spin-spin correlations and single-spin expectation values change discontinuously at a critical value, x(phi)(N), of the ratio of perturbing to unperturbed interaction strengths, x =J'/J. Our results provide evidence for a new type of zero-temperature phase transition on the infinite square lattice of possible relevance to the theory of high-T(c) superconductors.

引用

页码：10602 / 10605

页数：4

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