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.

已经开发了一种法拉第力量磁力计，用于在低于300MK的非常低温和最高9T的磁场下进行静态磁化测量。作用在位于稀释冰箱绝热真空室中的标本上的磁力可通过新设计的载荷载荷可变量可变可变的电容器检测。使用具有梯度线圈的超导磁体可以准确测量磁矩，其分辨率高于1x10^<-7> am^2（1x10^<-4>）。在CEB_6中，已经发现，在II阶段II阶段III边界[BLL（110）]中，发现急剧的磁化速度在0.5K以下发育[BLL（110）]。在CEPT_2SI_2中，（100）轴心磁化磁化强度在B-3T上没有尖锐的转换，但没有观察到尖锐的转换。在顺磁相1.5k以下的磁化磁化强度中已经发现了磁滞。我们将其归因于该化合物T-1.7K附近的GAMMA_8基态的四极有序的发生。

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）。

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。

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: "Effect of Transition Metal Substitution on the Metamagnetic Properties in CeRu_2Si_2" Physica B.

C.Sekine：“过渡金属取代对 CeRu_2Si_2 变磁性能的影响”Physica B.

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。