Static impurities in the S=1/2 kagome lattice:: Dimer freezing and mutual repulsion -: art. no. 224416

被引:56
|
作者
Dommange, S [1 ]
Mambrini, M
Normand, B
Mila, F
机构
[1] PPH Ecublens, IRRMA, CH-1015 Lausanne, Switzerland
[2] Univ Toulouse 3, Phys Theor Lab, F-31062 Toulouse, France
[3] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland
[4] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland
来源
PHYSICAL REVIEW B | 2003年 / 68卷 / 22期
关键词
D O I
10.1103/PhysRevB.68.224416
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We consider the effects of doping the S=1/2 kagome lattice with static impurities. We demonstrate that impurities lower the number of low-lying singlet states, induce dimer-dimer correlations of considerable spatial extent, and do not generate free spin degrees of freedom. Most importantly, they experience a highly unconventional mutual repulsion as a direct consequence of the strong spin frustration. These properties are illustrated by exact diagonalization, and are reproduced to semiquantitative accuracy within a dimer resonating-valence-bond description which affords access to longer length scales. We calculate the local magnetization induced by doped impurities, and consider its implications for nuclear magnetic resonance measurements on known kagome systems.
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页数:9
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