Magneto-Acoustic Effect of the Heavy Fermion Compound by Giga-Hertz Ultrasonic Measurement

通过千兆赫兹超声波测量重费米子化合物的磁声效应

• 批准号: 03452030
• 负责人: GOTO Terutaka
• 金额: $ 4.67万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452030/
• 关键词: ultrasound; heavy Fermion; magneto-acoustic effect; electron-lattice interaction; acoustic dHvA effect; dilution refrigerator; two-circle goniometer; magnetostriction; 電子ー格子相互作用; ヘビ-フェルミオン; 音響的ドハ-ス・ファンアルフェン効果; フェルミ面; 電子ー歪み相互作用; CeB6

Employing the ultrasonic measurements, we have investigated the electron-strain interaction of the rare earth compounds, in particular the heavy Fermion and valence fluctuation systems. In the present research we constructed a new ultrasonic system based on the monodyne detection and its phase comparator for the high frequency ultrasonic signal up to 1 GHz. For the low temperature measurement with the dilution refrigerator, the coaxial air line and the cryo-amplifier up to 1 GHz have been developed. Furthermore the various sample-orienting devices of the spiral gear and the two-circle goniometer have been designed. In the acoustic de Haas-van Alphen measurements, we focused the various heavy Fermion compounds. In particular we successfully observed the heavy hole state in CeSb. This result provides an essential evidence for the p-f mixing mechanism in CeSb proposed by Kasuya et al. And the observed large oscillatory intensity is due to the remarkable enhancement of the density of state in the hole state. The experiment of the acoustic dHvA effect and the oscillatory magnetostriction may provide rich information on the unusual character of the electron- strain interaction in the heavy Fermion and superconducting compounds. Anyway further continuous research with the ultrasonic method should be required.

本文利用超声测量方法研究了稀土化合物中的电子-应变相互作用，特别是重费米子和价态涨落体系。本研究构建了一种基于单差检测及其相位比较器的新型超声系统，用于接收高达1GHz的高频超声信号。为实现稀释制冷机的低温测量，研制了频率高达1GHz的同轴空气管路和低温放大器。并设计了螺旋齿轮和双圆测角仪等多种样品定向装置。在声学de Haas-van Alphen测量中，我们重点研究了各种重费米子化合物。特别是我们成功地观察到了CeSb中的重空穴态。这一结果为Kasuya等人提出的CeSb中的p-f混合机制提供了必要的证据，而所观察到的大的振荡强度是由于空穴态态密度的显著增强。声学dHvA效应和振荡磁致伸缩实验可以为重费米子和超导化合物中电子-应变相互作用的异常性质提供丰富的信息。无论如何，还需要对超声方法进行进一步的持续研究。

项目成果

H.Goto: "Dielectric dispersion of Valence fluctuation compound Sm3Se4" J.Phys.Soc.Jpn.(1993)

H.Goto：“化合价波动化合物 Sm3Se4 的介电色散”J.Phys.Soc.Jpn.(1993)

S.Salzatsume: "Cryowagnetic system for the acoustic de Haas-Van Alphen effect" Physica B. (1993)

S.Salzatsume：“声学 de Haas-Van Alphen 效应的低温磁系统”Physica B. (1993)

R.Settai, T.Goto and Y.Onuki: "Acoustic de Haas - van Alphen Effect of YCu_2 and CeCu_2" J.Phys.Soc.Jpn.61. 609-615 (1992)

R.Settai、T.Goto 和 Y.Onuki：“声学德哈斯 - YCu_2 和 CeCu_2 的范阿尔芬效应”J.Phys.Soc.Jpn.61。

R.Settai, M.Chida, S.Yanagida and T.Goto: "Two-Circle Goniometer for Measurement of Acoustic de Haas-van Alphen Effect" Jpn.J.Appl.Phys.31. 3736-3737 (1992)

R.Settai、M.Chida、S.Yanagida 和 T.Goto：“用于测量声学 de Haas-van Alphen 效应的双圆测角仪”Jpn.J.Appl.Phys.31。

S.Nakamura: "Magneto elastic interaclion of rare eurth hexa Dorides" Physica B. (1993)

S.Nakamura：“稀有 eurth hexa Dorides 的磁力弹性相互作用”Physica B. (1993)