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Study of the acoustic de Haas effect by the ultrasonic measurements

超声测量研究声德哈斯效应

基本信息

批准号：
09304039
负责人：
GOTO Terutaka
金额：
$ 26.37万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09304039/
关键词：
ultrasound acoustic de Haas effect dilution refrigerator Heavy Fermion high magnetic field Fermi surface 音響ドバース効果重い電子系四重極子効果軌道自由度電荷自由度 Yb_4A_3 Ce_XLa_<1-X>B_6

项目摘要

The de Haas effect of the oscillatory magnetization is a method to observe the Fermi surface of metallic compounds. The acoustic de Haas effect by the measurement of the sound velocity and attenuation coefficient is a unique method to determine the electron-lattice interaction in the itinerant electron system. In the present project, we focus on the precise measurement of the sound velocity as a function of the magnetic field at low temperatures. In the case of the heavy Fermion system, the measurements in the extreme condition with low temperature and high magnetic field is required to detect the quantum oscillation due to the Landau state in field. In the last three years, we have developed an low-temperature ultrasonic system with a superconducting magnet up to 180kOe and a dilution refrigerator down to 10mK. The top-loading probe of the dilution refrigerator is equipped by a gonio meter for sample rotation and coaxial lines for high frequency measurement. For the first cooling, we measured a typical example of the heavy Fermion systems CeRuィイD22ィエD2SiィイD22ィエD2, which has been grown by Prof. Onuki. Above the metamagetic transition of 80kOe, the quantum oscillation of the longitudinal CィイD211ィエD2 mode has been clearly detected below 600mK down to 20mK. The effective mass of the branch is 3.5m0. The ultrasonic measurement system in low temperature and high magnetic field in Niigata University is the most excellent apparatus for the investigation of the Fermi surface of the heavy Fermion system, the quadrupolar effect of 4f- and 3d-elecron compounds and the charge fluctuation effect in the mixed valence compounds. Our ultrasonic system is opened for cooperative works with many scientist in the world.

振荡磁化的de哈斯效应是观察金属化合物费米面的一种方法。通过测量声速和衰减系数的声学de哈斯效应是确定巡游电子系统中电子-晶格相互作用的唯一方法。在本项目中，我们专注于在低温下作为磁场的函数的声速的精确测量。在重费米子系统中，需要在低温、强磁场的极端条件下进行测量，才能探测到场的朗道态引起的量子振荡。在过去的三年里，我们已经开发了一个低温超声系统，超导磁体高达180 kOe和稀释制冷机低至10 mK。稀释冰箱的顶部加载探头配备有用于样品旋转的测角仪和用于高频测量的同轴电缆。对于第一次冷却，我们测量了由Onuki教授生长的重费米子系统CeRu D22 D2 Si D22 D2的典型例子。在80 kOe以上的变磁跃迁中，在600 mK以下至20 mK，都能清楚地检测到纵向C_（10）D_（211）D_（22）模的量子振荡。分支的有效质量为3.5m0。新泻大学的低温强磁场超声波测量系统是研究重费米子系统的费米面、4f-和3d-电子化合物的四极效应以及混合价化合物中电荷涨落效应的最佳装置。我们的超声波系统是开放的合作工作与许多科学家在世界上。