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.

采用超声测量，我们研究了稀土化合物的电子 - 应变相互作用，尤其是重型费米和价波动系统。在本研究中，我们基于Monodyne检测及其对高频超声信号的相比较器构建了一个新的超声系统，高达1 GHz。为了使用稀释冰箱进行低温测量，已经开发了高达1 GHz的同轴空气线和冷冻放大器。此外，已经设计了螺旋齿轮的各种面向样品的设备。在声学的Alphen测量值中，我们集中了各种重型费米亚化合物。特别是我们成功地观察了CESB中的重孔状态。该结果为Kasuya等人提出的CESB中的P-F混合机制提供了基本证据。观察到的较大振荡强度是由于孔状态下状态密度的显着增强所致。声学DHVA效应和振荡性磁截图的实验可能会提供有关重型费米亚和超导化合物中电子相互作用的异常特征的丰富信息。无论如何，应该需要对超声波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, 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)

R.Settai et al: "Acoustic detteasーvan Alphen Effect of YCu_2 and CeCu_2" Journal of The Physical Society of Japan. 61. 609-615 (1992)

R.Settai 等人：“YCu_2 和 CeCu_2 的声学 detteas-van Alphen 效应”，日本物理学会杂志 61. 609-615 (1992)。