Collapse of Ferrimagnetism in Two-Dimensional Heisenberg Antiferromagnet due to Frustration

Details Collapse of Ferrimagnetism in Two-Dimensional Heisenberg Antiferromagnet due to Frustration Collapse of Ferrimagnetism in Two-Dimensional Heisenberg Antiferromagnet due to Frustration

2011-02-16

arxiv.org/abs/1102.3244v1

J. Phys. Soc. Jpn. 80 (2011) 033709

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures, accepted in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.80.033709

We study ferrimagnetism in the ground state of the antiferromagnetic Heisenberg model on the spatially anisotropic kagome lattice, in which ferrimagnetism of the conventional Lieb-Mattis type appears in the region of weak frustration whereas the ground state is nonmagnetic in the isotropic case. Numerical diagonalizations of small finite-size clusters are carried out to examine the spontaneous magnetization. We find that the spontaneous magnetization changes continuously in the intermediate region between conventional ferrimagnetism and the nonmagnetic phase. Local magnetization of the intermediate state shows strong dependence on the site position, which suggests non-Lieb-Mattis ferrimagnetism.

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