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論文

Metamagnetic behavior in heavy-fermion compound YbIr$$_2$$Zn$$_{20}$$

竹内 徹也*; 安井 慎一*; 戸田 雅敏*; 松下 昌輝*; 吉内 伸吾*; 大家 政洋*; 片山 敬亮*; 広瀬 雄介*; 吉谷 尚久*; 本多 史憲*; et al.

Journal of the Physical Society of Japan, 79(6), p.064609_1 - 064609_15, 2010/06

https://doi.org/10.1143/JPSJ.79.064609
 被引用回数：43 パーセンタイル：83.25(Physics, Multidisciplinary)

Metamagnetic behavior of the heavy-fermion compound YbIr$$_2$$Zn$$_{20}$$ was studied by magnetization, de Haas-van Alphen effect, magnetoresistance, specific heat, thermal expansion and magnetostriction. Metamagnetic behavior was observed for all the physical properties at low temperatures. It is remarkable that the Fermi surfaces observed in the dHvA effect unchanges across the metamagnetic transition.

論文

Low-temperature magnetic orderings and Fermi surface properties of LaCd$$_{11}$$, CeCd$$_{11}$$, and PrCd$$_{11}$$ with a caged crystal structure

吉内 伸吾*; 竹内 徹也*; 大家 政洋*; 片山 敬亮*; 松下 昌輝*; 吉谷 尚久*; 西村 尚人*; 太田 尚志*; 立岩 尚之; 山本 悦嗣; et al.

Journal of the Physical Society of Japan, 79(4), p.044601_1 - 044601_11, 2010/04

https://doi.org/10.1143/JPSJ.79.044601
 被引用回数：15 パーセンタイル：63.91(Physics, Multidisciplinary)

We succeeded in growing single crystals of cage-structure compounds RCd$$_{11}$$ (R: La, Ce, and Pr) and precisely studied their low-temperature magnetic and electronic properties. We found antiferromagnetic ordering at 0.44 and 0.39 K in CeCd$$_{11}$$ and PrCd$$_{11}$$, respectively, and clarified the magnetic phase diagrams of the compounds. From the dHvA experiment, we detected small dHvA branches ranging from 7$$times$$10$$^5$$ to 2$$times$$10$$^7$$ Oe, which correspond to small Fermi surfaces. This is mainly due to a small Brillouin zone based on a large unit cell. Moreover, the dHvA frequencies and cyclotron masses are approximately the same among RCd$$_{11}$$, revealing a localized character of 4f electrons in CeCd$$_{11}$$ and PrCd$$_{11}$$.

論文

Pressure-induced superconductivity in antiferromagnet CePd$$_5$$Al$$_2$$

本多 史憲*; M$'e$asson, M.-A.*; 中野 泰典*; 吉谷 尚久*; 山本 悦嗣; 芳賀 芳範; 竹内 徹也*; 山上 浩志*; 清水 克哉*; 摂待 力生*; et al.

Journal of the Physical Society of Japan, 77(4), p.043701_1 - 043701_4, 2008/04

https://doi.org/10.1143/JPSJ.77.043701
 被引用回数：40 パーセンタイル：81.82(Physics, Multidisciplinary)

Pressure effect on the antiferromagnet CePd$$_5$$Al$$_2$$ has been investigated. By applying pressure, the antiferromagnetic transition temperature increases up to 5 GPa. Further applying pressure, the antiferromagnetic transition smears out rapidly and finally superconducting region arises around 10 K.

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