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 HAAS效应是一种观察金属化合物的费米表面的方法。通过测量声速度和衰减系数的测量效应是确定巡回电子系统中电子晶格相互作用的独特方法。在本项目中，我们专注于在低温下声音速度作为磁场的函数的精确测量。在重型费米亚系统的情况下，需要低温和高磁场的极端条件下的测量值才能检测到田间中的兰道态引起的量子振荡。在过去的三年中，我们开发了一个低温超声系统，具有高达180KOE的超导磁铁，稀释冰箱降至10MK。稀释冰箱的最高负载探针与Gonio仪表相等，用于样品旋转和同轴线以进行高频测量。对于第一次冷却，我们测量了一个典型的Fermion Systems CERUI D22SII D22，该系统由Onuki教授生长。在80KOE的替代过渡上方，纵向CERUI D211 D2模式的量子振荡已清楚地检测到低于600MK至20MK。该分支的有效质量为3.5m0。 Niigata University的低温和高磁场的超声测量系统最多。重型费米恩系统的费米表面投资，4F-和3D电子族化合物的四极效应以及混合价化合物中电荷波动效应的出色设备。我们的超声系统是与世界上许多科学家合作开放的。