HIGH FIELD STUDY ON THE MAGNETIC MATERIALS OF LOW CHARACTERISTIC TEMPERATURE - Very Low Temperature Magnetization

低温磁性材料的高场研究——极低温磁化

• 批准号: 04452030
• 负责人: SAKAKIBARA Toshiro
• 金额: $ 5.31万
• 依托单位: (Faculty of Science) Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452030/
• 关键词: Very low temperature magnetization measurements,; Faraday force magnetometer,; Heavy-electron systems; Metamagnetic transitions; Kondo effects,; Quadrupolar interactions; ファラデー法; キャパシタンス変位計; ファラデー法磁化測定; 極低温強磁場; 希釈近藤格子系; 局所環境効果; コーチャンネル近藤効果; 磁

A Faraday force magnetometer has been developed for the static magnetization measurements at very low temperatures below 300mK and in fields up to 9T.The magnetic force acting on a specimen located in the adiabatic vacuum chamber of a dilution refrigerator is detected by a newly designed load-sensing variable capacitor. Use of a superconducting magnet with gradient coils enables an accurate measurement of a magnetic moment with a resolution of better than 1x10^<-7>Am^2(1x10^<-4>). A number of exlperiments have been done on heavy-electron systems.In CeB_6, a sharp magnetization jump has been found to develop below 0.5K at the phase II-phase III boundary [Bll(110)].In CePt_2Si_2, the (100) axis magnetization changes its slope at B-3T, however, no sharp metamagnetic transition has been observed down to 0.3K.In TmTe, an unusaul hysteresis has been found in the magnetization of the paramagnetic phase below 1.5K.We attribute this to an occurrence of quadrupolar ordering of the GAMMA_8 ground state of this compound around T-1.7K.

本文介绍了一种适用于低温（300 mK以下）和高磁场（9 T）条件下静态磁化强度测量的法拉第力磁强计。使用具有梯度线圈的超导磁体能够以优于1x 10 ^<-7>Am^2（1x 10 ^<-4>）的分辨率精确测量磁矩。对重电子系统进行了大量实验研究，发现在CeB_6中，在0.5K以下，在Ⅱ-Ⅲ相边界[B11（110）]处出现了一个急剧的磁化强度跃变，在CePt_2Si_2中，（100）轴磁化强度在B-3 T处发生了斜率变化，但在0.3K以下没有观察到明显的变磁转变，在TmTe中，（100）轴磁化强度随温度的升高而增大，在TmTe中，（100）轴磁化强度随温度的升高而增大，在TmTe中，（100）轴磁化强度随温度的升高而减小。在1.5K以下，顺磁相的磁化强度出现了一个独特的磁滞现象，我们认为这是由于该化合物在T-1.7K附近的γ_8基态出现了四极有序。

项目成果

H.Amitsuka: "Single Uranium Site Properties of the Dilute Heavy Electron Systems U_xTh_<1-x>Ru_2Si_2(x<0.07)" Journal of the Physical Society of Japan. (印刷中).

H. Amitsuka：“稀重电子系统 U_xTh_<1-x>Ru_2Si_2(x<0.07) 的单铀位点特性”，日本物理学会杂志（正在出版）。

T.Sakakibara: "Single-site and inter-site effects in diluted heavy fermion compounds" Physica B. 186-188. 317-322 (1993)

T.Sakakibara：“稀释重费米子化合物中的单位点和位点间效应”Physica B. 186-188。

C.Sekine, T.Sakakibara, H.Amitsuka and Y.Miyako: ""Magnetic properties and phase diagram of Ce(Ru_<1-x>Rh_x)_2Si_2"" Journal of the Physical Society of Japan. 61. pp.4536-4546 (1992)

C.Sekine、T.Sakakibara、H.Amitsuka 和 Y.Miyako：“Ce(Ru_<1-x>Rh_x)_2Si_2 的磁性和相图””日本物理学会杂志。

H.Amitsuka: "Evidence of Unusual Kondo Effect in Diluted Uranium Compounds U_xTh_<1-x>Ru_2Si_2(x<0.1)" Physica B. 186-188. 337-340 (1993)

H.Amitsuka：“稀铀化合物 U_xTh_<1-x>Ru_2Si_2(x<0.1) 中异常近藤效应的证据”Physica B. 186-188。

H.Amitsuka: "Evidence of Unnsual Kondo Effect in Diluted Uranium Compounds U_XTh_<1-X>Ru_2Si_2(x(] SY.ltoreq. [)0.1)" Physica B.

H.Amitsuka：“稀铀化合物 U_XTh_<1-X>Ru_2Si_2(x(] SY.ltoreq.[)0.1) 中异常近藤效应的证据”Physica B.