Novel Field-Induced Quantum Phase Transition of the Kagome-Lattice Antiferromagnet

被引:0
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作者
Sakai, Toru [1 ,2 ]
Nakano, Hiroki [2 ]
机构
[1] SPring 8, Japan Atom Energy Agcy, Sayo, Hyogo 6795148, Japan
[2] Univ Hyogo, Grad Sch Mat Sci, Kamigori, Hyogo 6781297, Japan
关键词
HEISENBERG-ANTIFERROMAGNET;
D O I
10.1088/1742-6596/400/3/032076
中图分类号
O59 [应用物理学];
学科分类号
摘要
The magnetization process of the S = 1/2 kagome-lattice quantum antiferromagnet is investigated using the numerical exact diagonalization up to 39-site clusters. The finite-size scaling analysis with the rohmbic clusters indicated the "magnetization ramp" as a novel field-induced quantum phase transition at 1/3 of the saturation magnetization. The magnetization ramp is characterized by the following properties; (i) the field derivative dm/dH is divergent at the lower-field side, (ii) dm/dH is vanishing at the higher-field side, and (iii) there is a single critical field H-c (no plateau). Applying the critical exponent analysis for the non-rohmbic clusters, as well as the rohmbic ones, we confirmed the above properties of the magnetization at 1/3 of the saturation for the kagome lattice antiferromagnet.
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页数:4
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