Oscillatory Striction and Electron-Lattice Interaction

振荡限制和电子晶格相互作用

基本信息

批准号：
07454075
负责人：
GOTO Terutaka
金额：
$ 5.12万
依托单位：
Niigata University (1996)Tohoku University (1995)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454075/
关键词：
magneto-striction acoustic de Haas effect Fermi surface ultrasound electron-lattice interaction strongly correlated system low carrier system capacitance cell 電子-格子相互作用希土類モノプニクタイト

项目摘要

The quantum oscillation of the elastic constant of metallic compounds at low temperature as a function of applied field is called as the acoustic de Haas effect. This is an excellent probe to determine the electron-lattice interaction of the conduction electron system, which is related to the BCS mechanism of superconductivity. Goto has established the experimental method of the acoustic de Haas effect at low temperatures by 3He cryostat and dilution refrigerator. The sample length of metallic compounds also showes the quantum oscillation at low temperatures. This is called as the oscillatory magneto-striction, which is also originated from the electron-lattice interaction on the Fermi surface. In the present research project we have studied the acoustic de Haas effect by the ultrasonic velocity as well as the magneto-striction. We have done a development of the apparatuse for the oscillatory magneto-striction based on the capacitance measrement with a capacitance bridge. The capacitan … More ce method is excellent for the low temperature measurements because the capacitance bridge provides an ideal prove with quite small input power. Furthermore the highly resolution of capacitance bridge leads an accurate measurement of the oscillatory intensity which is related to the electron-lattice coupling. In this project we developed the capacitance cell, which may control sample orientation along applied magnetic fields inside the superconducting magnet. In the present project we made the magneto-striction apparatus for the 3He cryostat, but more sophisticated system for the dilution refrigerator is still remained to be developed.The investigation of the acoustic de Haas effect on the low carrier compounds on rare earth monopnictides, CeBi, LaBi, LaAs and uranium compound USb were performed intensively in this project. The observation of the heavy hole surface beta4 in Ce Bi gave an evidence for the p-f mixing mechanism in the system. The oscillation intensity of the acoustic de Haas effect on LaAs and LaBi shows that the electron-lattice interaction of the longitudinal sound wave containing the volume strain in low carrier compounds is enhanced considerably. This is an very important result relating to the electron correlation in the low carrier system. Less

在低温下，金属化合物的弹性常数随施加场的函数的量子振荡称为声学效应。这是确定传导电子系统的电子晶格相互作用的出色探针，该探针与BCS超导性机理有关。 Goto通过3HE低温和稀释冰箱在低温下建立了声学效果的实验方法。金属化合物的样品长度还显示在低温下的量子振荡。这被称为振荡磁曲，最初也是最初来自费米表面上的电子静态相互作用。在本研究项目中，我们研究了超声速度和磁曲目的声学效应。我们已经基于电容桥的电容测量值来开发振荡性磁曲线的设备。电容……更多的CE方法非常适合低温测量值，因为电容桥提供了一个理想的证明，其输入功率很小。此外，电容桥的高度分辨率可准确测量与电子晶体耦合有关的振荡强度。在这个项目中，我们开发了电容电池，该电容器可能控制沿超导磁体内的磁场的样品取向。在本项目中，我们制作了3HE低温恒温器的磁性计算设备，但是对于稀释冰箱的更复杂的系统仍在开发中。 CE BI中重孔表面Beta4的观察提供了系统中P-F混合机制的证据。声学效应对LAA和LABI的振荡强度表明，仔细地增强了含有低载体化合物中体积应变的纵向声波的电子静态相互作用。这是与低载体系统中电子相关性有关的非常重要的结果。较少的