OBSERVATION OF S = 1/2 DEGREES OF FREEDOM IN AN S = 1 LINEAR-CHAIN HEISENBERG-ANTIFERROMAGNET

被引：369

作者：

HAGIWARA, M

KATSUMATA, K

AFFLECK, I

HALPERIN, BI

RENARD, JP

机构：

[1] UNIV BRITISH COLUMBIA,CANADIAN INST ADV RES,VANCOUVER V6T 2A6,BC,CANADA

[2] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 2A6,BC,CANADA

[3] HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138

[4] UNIV PARIS 11,INST ELECTR FONDAMENTALE,F-91405 ORSAY,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.65.3181

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

THe ground state of the typical spin-1 linear-chain Heisenberg antiferromagnet Ni(C2H8N2)2NO2(ClO4) containing a small amount of Cu2+ is studied by the electron-spin-resonance (ESR) technique. The ESR results are qualitatively explained by the model that the valence bonds are broken at the Cu2+ sites resulting in spin-1/2 states at the Ni2+ sites neighboring the Cu2+. Thus the present study gives experimental evidence for the existence of the valence-bond-solid ground state in S=1 linear-chain Heisenberg antiferromagnets. © 1990 The American Physical Society.

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页码：3181 / 3184

页数：4

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