Precise Magnetization Study of UPd_2Al_3 at Ultralow Temperatures

UPd_2Al_3超低温磁化的精密研究

• 批准号: 12640333
• 负责人: SAKON Takuo
• 金额: $ 2.37万
• 依托单位: Akita University (2001)Tohoku University (2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640333/
• 关键词: Magnetization; Heary Electrons; Ultralow Tempemture; Dilution Refrigerator; 20T Super conducting Mrgnet; High Magnetic Fields; f-electrons; Magnetic hase Diagram; 20テスラ超電磁石; 超伝導磁石

Isothermal magnetization processes of a Uranium compound UPd_2Al_3 is first studied at temperatures down to 40 mK in static magnetic fields up to 20 T using a superconducting magnet and a hybrid magnet with a 'Capacitance Method' type magnetometer newly developed by ourselves. A sharp metamagnetic transition is shown around 18T for B// basal plane of hexagonal structure. Moreover, a hysteresis have been first observed below 4.2 K. The hysteresis becomes larger with decreasing temperature and is as large as about 0.02 T at 40 mK. This hysteresis and sharp transition of the magnetization suggest that this transition is of the first order. The transition field becomes higher with lowering temperature.

首先使用超导磁体和混合磁体以及我们新开发的“电容法”型磁力计在高达 20 T 的静磁场中在低至 40 mK 的温度下研究了铀化合物 UPd_2Al_3 的等温磁化过程。对于六方结构的B//基面，在18T附近显示出急剧的变磁转变。此外，在低于4.2K时首次观察到滞后。随着温度降低，滞后变得更大，并且在40mK时高达约0.02T。这种磁滞现象和磁化强度的急剧转变表明这种转变是一阶的。随着温度降低，过渡场变得更高。

项目成果

Takuo Sakon,N.K.Sato,T.komatsubara,M.Motokawa: "Temperature and Field Dependence of Magnetization on UPd_2Al_3"Physica B. 281-282巻. 240-241 (2000)

Takuo Sakon、N.K.Sato、T.komatsubara、M.Motokawa：“UPd_2Al_3 上磁化的温度和磁场依赖性”Physica B. vol. 281-282 (2000)。

T.Sakon: "Magnetic Phase Diagram of UPd_2 Al_3 in high magnetic fields"Japanese Journal of Applied Physics. 41(掲載決定). (2002)

T.Sakon：“强磁场中 UPd_2 Al_3 的磁相图”，日本应用物理学杂志 41（出版）。

T.Sakon: "Magnetic phase diagram of UPd_2Al_3 in high magnetic fields"Japanese Journal of Applied Physics. 41(掲載決定). (2002)

T.Sakon：“高磁场中UPd_2Al_3的磁相图”日本应用物理学杂志41（出版）。

T.Sakon: "Magnetomechanical Magnetization Measurements at Ultralow Temperature"Review of Scientific Instruments. 71巻. 3474-3477 (2000)

T.Sakon：“超低温下的磁机械磁化测量”科学仪器评论，第 71 卷，3474-3477 (2000)。

T.Sakon: "Magnetization of UPd_2 Al_3 in ultralow temperature and high magnetic fields"Journal of Magnetism and Magnetic Materials. 226-230. 75-76 (2001)

T.Sakon：“超低温高磁场下UPd_2 Al_3的磁化”《磁性与磁性材料杂志》。