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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

金属化合物在低温下的弹性常数随外加场变化的量子振荡称为声德哈斯效应。这是确定传导电子系统的电子-晶格相互作用的优秀探针，这与超导的BCS机制有关。后藤利用3He低温恒温器和稀释制冷机建立了低温下声德哈斯效应的实验方法。金属化合物的样本长度也显示了低温下的量子振荡。这被称为振荡磁致伸缩，它也源于费米表面上的电子-晶格相互作用。在当前的研究项目中，我们研究了超声波速度和磁致伸缩的声德哈斯效应。我们开发了基于电容电桥电容测量的振荡磁致伸缩装置。电容 ce 方法非常适合低温测量，因为电容电桥以相当小的输入功率提供了理想的证明。此外，电容电桥的高分辨率可以精确测量与电子晶格耦合相关的振荡强度。在这个项目中，我们开发了电容单元，它可以沿着超导磁体内部施加的磁场控制样本方向。在本项目中，我们制造了用于 3He 低温恒温器的磁致伸缩装置，但用于稀释制冷机的更复杂的系统仍有待开发。该项目集中研究了稀土单磷族化合物、CeBi、LaBi、LaAs 和铀化合物 USb 上的低载流子化合物的声德哈斯效应。 Ce Bi中重孔表面β4的观察为系统中的p-f混合机制提供了证据。 LaAs和LaBi的声德哈斯效应的振荡强度表明，低载流子化合物中含有体积应变的纵向声波的电子-晶格相互作用显着增强。这是与低载流子系统中的电子关联相关的非常重要的结果。较少的