Singlet excitations in pyrochlore: A study of quantum frustration

被引：105

作者：

Berg, E ^{[1
]}

Altman, E ^{[1
]}

Auerbach, A ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.90.147204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We apply the contractor renormalization (CORE) method to the spin half Heisenberg antiferromagnet on the frustrated checkerboard and pyrochlore lattices. Their ground states are spin-gapped singlets which break lattice symmetry. Their effective Hamiltonians describe fluctuations of orthogonal singlet pairs on tetrahedral blocks, at an emergent low energy scale. We discuss low temperature thermodynamics and new interpretations of finite size numerical data. We argue that our results are common to many models of quantum frustration.

引用

页数：4

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