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ID 30124
本文ファイル
著者
Sengupta, K.
Forthaus, M. K.
Kubo, Hirokazu
Katoh, Kenichi
Abd-Elmeguid, M. M.
NDC
物理学
抄録(英)
We have investigated the effect of pressure on the magnetic and structural properties of the frustrated heavy-fermion antiferromagnet YbAgGe in an extended pressure range up to 20 GPa using electrical resistivity and x-ray diffraction, respectively. We find that with increasing pressure, the magnetic ordering temperature (Tm) first increases rapidly, passes through a maximum (Tm=5.4 K at 6.8 GPa), and then drops toward zero for p above 16 GPa, while the structure remains unchanged up to about 20 GPa. We attribute the anomalous pressure dependence of Tm to a complex interplay between the Kondo effect, Ruderman-Kittel-Kasuya-Yosida interactions and the geometrical frustration of the magnetic interactions of the Yb moments in the Kagomé-latticelike structure of YbAgGe. We further discuss the competition between geometrical frustration and long-range magnetic order together with the possible occurrence of a pressure-induced second quantum critical point in YbAgGe.
掲載誌名
Physical Review B
81巻
12号
出版年月日
2010
出版者
American Physical Society
ISSN
1098-0121
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
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application/pdf
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権利情報
Copyright (c) 2010 The American Physical Society
関連情報URL
部局名
先端物質科学研究科
自然科学研究支援開発センター