Ground State and Elementary Excitations of the S=1 Kagome Heisenberg Antiferromagnet

Details Ground State and Elementary Excitations of the S=1 Kagome Heisenberg Antiferromagnet Ground State and Elementary Excitations of the S=1 Kagome Heisenberg Antiferromagnet

2000-05-29

arxiv.org/abs/cond-mat/0005494v2

J. Phys. Soc. Jpn. 69 (2000) 4003

Physics

Condensed Matter

Statistical Mechanics

5 pages, 7 eps figures, 2 tables, Fig. 4 corrected

Scientific paper

10.1143/JPSJ.69.4003

Low energy spectrum of the S=1 kagom\'e 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 \mpynn. 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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