Ground state and elementary excitations of the S=1 kagome Hisenberg antiferromagnet

被引：48

作者：

Hida, K ^{[1
]}

机构：

[1] Saitama Univ, Fac Sci, Dept Phys, Urawa, Saitama 3338750, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 12期

关键词：

kagome Heisenberg antiferromagnet; Pade approximation; cluster expansion method; numerical diagonalization; hexagonal singlet solid state;

D O I：

10.1143/JPSJ.69.4003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Low energy spectrum of the S = 1 kagome Heisenberg antiferromagnet (KHAF) is studied by means of exact diagonalization and the cluster expansion. The magnitude of the energy gap of the magnetic excitation is consistent with the recent experimental observation for m-MPYNN . BF4. In contrast to the S = 1/2 KHAF, the non-magnetic excitations have finite energy gap comparable to the magnetic excitation. As a physical picture of the ground state, the hexagon singlet solid state is proposed and verified by variational analysis.

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页码：4003 / 4007

页数：5

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