Magnetization Step in Spatially Distorted Heisenberg Kagome Antiferromagnets

Details Magnetization Step in Spatially Distorted Heisenberg Kagome Antiferromagnets Magnetization Step in Spatially Distorted Heisenberg Kagome Antiferromagnets

2010-04-14

arxiv.org/abs/1004.2401v1

J. Phys. Soc. Jpn. 79 (2010) 073708

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.79.073708

Motivated by recent experiment for volborthite, a typical spin-1/2 antiferromagnet with kagome lattice structure, we study magnetization process of classical Heisenberg model on a spatially distorted kagome lattice using Monte Carlo (MC) method. We find a distortion-induced magnetization step at low temperatures and low magnetic fields. Magnitude of this step is given by Delta m_z=|1-alpha|/3alpha at zero temperature, where alpha denotes spatial anisotropy in exchange constants. The magnetization step signals a first-order transition at low temperatures, between two phases distinguished by distinct and well developed short-range spin correlations, one characterized by coplanar spin alignment with a \sqrt{3}\times\sqrt{3} period, and the other by a non-coplanar and partially spin flopped structure. We point out the relevance of our results to the unconventional steps observed in volborthite.

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