Ultrasonic Investigation of f-Electron Systems

f 电子系统的超声波研究

• 批准号: 01460027
• 负责人: GOTO Terutaka
• 金额: $ 4.29万
• 依托单位: Tohoku 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: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460027/
• 关键词: Ultrasonic; f-electron; Heavy electron; Valence Fluctuation; de Haas-van Alphen Effect; Rare earth compound

Ultrasonic measurements have been employed for the investigation of the elastic properties of the various rare earth compounds involving the strongly correlated 4f-electrons. The ultrasonic apparatus based on the phase comparison method, which has been developed by our group, reveals the extremely high resolution to detect the sound velocity change better than 10^<-7>. In the present research project, the many improvements for the high frequency sound wave experiments up to 1.3GHz have been performed. The Signal generator, 9087, Racal-Dana, England, plays an important role. For the generation of the high frequency sound waves, we developed the fabrication technique of the piezoelectric film of ZnO and PVDF (polyvinylidene-fluoride). In the last two years, the new apparatuses for the low temperature ultrasonic experiments have been established. The ^3He cryostat of the continuouscirculation provided the experiments at 0.32K. The ^3He-^4He dilution refrigerator is now cooled down to 8mK. … More It Should be noted that the 3He cryostat and the dilution refrigerator were developed by the machine shop in Research Institute for Scientific Measurements of Tohoku University.The characteristic features of the heavy electron and valence fluctuation states in rare earth compounds have been investigated by the ultrasonic measurements. It should be emphasized that the energy gap states in SmB_6 and CeNiSn were detected by the ultrasonic probes. The acoustic de Haas-van ALphen effect was also important subject of the present project. The measurements of the quantum oscillation of sound wave velocity on YCu_2,CeCu_2, UB_<12>, LaSb, CeSb, LaSn_3, CeSn_3 have been performed. The successful observation of acoustic of dHvA effect of the heavy electron compound CeB_6 utilizing the dilution refrigerator was a very important progress in the present project. The systematic investigation of the heavy electron systems with ultrasonic method at very low temperatures in still interesting and important subject. Less

用超声测量方法研究了涉及强关联4f电子的各种稀土化合物的弹性性质。本课题组研制的基于相位比较法的超声仪，对声速变化的探测分辨率高于10^~(-7)~(-7)。在本研究项目中，对1.3 GHz以下的高频声波实验进行了许多改进。英国拉卡尔-达纳的9087号信号发生器发挥着重要作用。为了产生高频声波，我们发展了氧化锌和聚偏氟乙烯(PVDF)压电薄膜的制备技术。在过去的两年里，已经建立了新的低温超声实验装置。连续循环的~3He低温恒温器在0.32K下提供了实验。^3He-^4He稀释制冷机现在冷却到8MK。…值得注意的是，3He低温恒温器和稀释式制冷机是由东北大学科学测量研究所的机械车间开发的。通过超声波测量，研究了稀土化合物中重电子和价态涨落的特征。需要强调的是，SMB_6和CeNiSn中的能隙状态是用超声探头探测到的。声学De Haas-van Alphen效应也是本项目的重要主题。测量了YCu2，CeCu2，UB&lt；12，LaSb，CeSb，LaSn3，CeSn3的声速量子振荡。利用稀释式制冷机成功地观测到重电子化合物CeB_6的dHvA声学效应是本项目的一个重要进展。用超声波法在极低温度下系统地研究重电子系统仍是一个有趣而重要的课题。较少

项目成果

H. Matsui, T. Goto, T. Fujimura, Y. Onuki, T. Komatsubara, Y. Isikawa and K. Sato :"Magneto-Acoustic Effect of Heavy Fermion Compound CeInCu_2" J. Phys. Soc. Jpn.,. 59. 3451-3454 (1990)

H. Matsui、T. Goto、T. Fujimura、Y. Onuki、T. Komatsubara、Y. Isikawa 和 K. Sato：“重费米子化合物 CeInCu_2 的磁声效应”J. Phys。

後藤 輝孝: "超音波でみる希土類化合物のf電子状態" 固体物理. 25. 1-12 (1990)

Terutaka Goto：“超声波观察到的稀土化合物的 F 电子态”《固体物理学》25. 1-12 (1990)。

D,Endoh: "Elastic Properties in.AuCu_3ーType Samarium Intermetallic Cempounds" J.Phys.Soc.Jpn.58. 940-948 (1989)

D，Endoh：“AuCu_3ー型钐金属间化合物的弹性性能”J.Phys.Soc.Jpn.58（1989）。

R.Settai: "Acoustic de Haasーvan Alphen Effect in fーElectron Systems" J.Mag.& Mag Mat.90&91. 446-448 (1990)

R.Settai：“f 电子系统中的声学 de Haas-van Alphen 效应”J.Mag.& Mag Mat.90&91 (1990)。

D. Endoh, T. Goto, A. Tamaki, B. Liu, M. Kasaya, T. Fujimura and T. Kasuya :"Elastic Properties in AuCu_3-Type Samarium Intermetallic Compounds" J. Phys. Soc. Jpn.,. 58. 940-948 (1989)

D. Endoh、T. Goto、A. Tamaki、B. Liu、M. Kasaya、T. Fujimura 和 T. Kasuya：“AuCu_3 型钐金属间化合物的弹性性能” J. Phys。