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Ground state and low-lying excitations of the spin- XXZ model on the kagomé lattice at magnetization

✍ Scribed by A. Honecker; D.C. Cabra; M.D. Grynberg; P.C.W. Holdsworth; P. Pujol; J. Richter; D. Schmalfuß; J. Schulenburg

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
182 KB
Volume
359-361
Category
Article
ISSN
0921-4526

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✦ Synopsis

We study the ground state and low-lying excitations of the S ¼ 1 2 XXZ antiferromagnet on the kagome´lattice at magnetization one-third of the saturation. An exponential number of non-magnetic states is found below a magnetic gap. The non-magnetic excitations also have a gap above the ground state, but it is much smaller than the magnetic gap. This ground state corresponds to an ordered pattern with resonances in one-third of the hexagons. The spin-spin correlation function is short ranged, but there is long-range order of valence-bond crystal type.

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