Oscillatory Striction and Electron-Lattice Interaction

金属化合物的弹性常数在低温下随外加电场的变化而发生的量子振荡称为声学de哈斯效应。这是一个很好的探针，以确定电子-晶格相互作用的传导电子系统，这是有关的BCS机制的超导。后藤等人建立了利用~ 3 He低温恒温器和稀释制冷机研究低温声de哈斯效应的实验方法。金属化合物的样品长度在低温下也表现出量子振荡。这就是所谓的振荡磁致伸缩，它也是由费米面上的电子-晶格相互作用引起的。在本研究计画中，我们利用超音波速度以及磁致伸缩来研究声致哈斯效应。研制了一种基于电容电桥电容测量的振荡磁致伸缩实验装置。电容器 ...更多信息 CE方法对于低温测量是极好的，因为电容电桥提供了具有相当小的输入功率的理想证明。此外，电容电桥的高分辨率使得与电子-晶格耦合有关的振荡强度的精确测量成为可能。在这个项目中，我们开发了电容池，它可以控制样品的取向沿着施加磁场内的超导磁体。本项目研制了用于~ 3 He低温恒温器的磁致伸缩装置，但用于稀释制冷机的磁致伸缩装置还有待于进一步的研究。本项目重点研究了低载流子稀土化合物CeBi、LaBi、LaAs和铀化合物USb的声de哈斯效应。对CeBi中重空穴表面β_4的观察，为系统中的p-f混合机制提供了证据。LaAs和LaBi的声学de哈斯效应的振荡强度表明，在低载流子化合物中，含有体应变的纵向声波的电子-晶格相互作用显著增强。这是有关低载流子系统中电子关联的一个非常重要的结果。少

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