Magnetization Process and Quantum Many-Body Effects in Spin-1/2 Triangular-Lattice Antiferromagnet(Research)
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- Tanaka Hidekazu
- 東京工業大学大学院理工学研究科
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- Kurita Nobuyuki
- 東京工業大学大学院理工学研究科
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- Matsuo Akira
- 東京大学物性研究所国際超強磁場科学研究施設
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- Kindo Koichi
- 東京大学物性研究所国際超強磁場科学研究施設
Bibliographic Information
- Other Title
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- スピンが1/2の三角格子反強磁性体の磁化過程と量子多体効果(最近の研究から)
- スピンが1/2の三角格子反強磁性体の磁化過程と量子多体効果
- スピン ガ 1/2 ノ サンカク ゴウシ ハン キョウジセイタイ ノ ジカ カテイ ト リョウシ タタイ コウカ
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Abstract
Hexagonal compound Ba_3CoSb_2O_9 approximates the two-dimensional S=1/2 triangular-lattice Heisenberg antiferromagnet, in which a magnetic Co^<2+> ion has an effective spin-1/2. We have performed high-field magnetization measurements on Ba_3CoSb_2O_9 using powdered sample and single crystals. For powdered sample, we found that the entire magnetization curve including the one-third quantum magnetization plateau is in excellent quantitative agreement with the results of theoretical calculations. However, for single crystals, we observed anisotropy in magnetization process. A one-third quantum plateau is clearly observed for H‖ab, whereas for H‖c, the magnetization curve exhibits a cusp near one-third of the saturation field. The suppression of the one-third plateau for H‖c is ascribed to the easy-plane anisotropy. For H‖ab, we found an small magnetization step above the plateau range indicative of a new high-field quantum phase.
Journal
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- Butsuri
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Butsuri 69 (1), 24-28, 2014-01-05
The Physical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001288158460800
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- NII Article ID
- 110009686560
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- NII Book ID
- AN00196952
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- ISSN
- 24238872
- 00290181
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- NDL BIB ID
- 025150483
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed