Hypersonic studies in Low dimensional electronic states with strong correlation

具有强相关性的低维电子态高超声速研究

• 批准号: 13640345
• 负责人: MATSUI Hiroshi
• 金额: $ 2.62万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640345/
• 关键词: ultrasonics; microwave; hypersonics; organic conductors; ultrasonic absorption; complex conductivity; st rongly correlated electrons; ギガヘルツ超音; ギガヘルツ超音波; ドハース効果

In this study, we constructed a hypersonic system to measure sound absorptions in microwave frequency range of low dimensional electronic systems with strong correlations. The excitation and detection of hypersonics were too difficult to realize, so that only a few studies were reported on a hypersonic absorption of solids. Our group possesses both ultrasound and microwave techniques, which are fundamentally required to build up the hypersonic system. We developed reentrant cavities with high Q values made of an oxygen free copper to generate and detect hypersonics. Most difficult thing was to control precisely the resonant frequency of the cavity, because the frequency varied with temperatures. A huge amount of times were necessary to develop the control mechanisms. Finally we achieved the frequency control by changing cavity volumes with three manipulators mounted on a top flange of the insert at room temperature. The electric circuits were based on a superheterodyne detection to increase resolution. We carried out longitudinal hypersonic measurements of single crystal quartz with 1 cm on length. First and second echo signals were successfully detected, and the temperature change of the absorption coefficient was identified to follow T^3 dependence.

本研究建立了一个高超声速测量系统，用于测量低维强关联电子系统微波频段的声反射。高超声速的激发和探测太难实现，因此只有少数研究报告了固体的高超音速吸收。我们的团队拥有超声波和微波技术，这是建立高超音速系统的基本要求。我们开发了由无氧铜制成的具有高Q值的凹腔，以产生和检测高超音速。最困难的事情是精确控制谐振腔的谐振频率，因为频率随温度而变化。开发控制机制需要大量的时间。最后，我们实现了频率的控制，通过改变腔的体积与三个机械手安装在顶部法兰的插入在室温下。电路基于超外差检测来提高分辨率。我们进行了纵向高超声测量的单晶石英长度为1厘米。成功地检测到第一和第二回波信号，并且确定吸收系数的温度变化遵循T^3依赖性。

项目成果

N.Toyota, H.Matsui: "Anomalous metallic state in λ-(BEDT-TSF)_2FeCL_4"Nihonbutsurigakkaishi. 57-8. 575-580 (2002)

N.Toyota，H.Matsui：“λ-(BEDT-TSF)_2FeCL_4 中的异常金属态”Nihonbutsurigakkaishi 57-8 (2002)。

S.Endo, et al.: "Anomalous Splitting of ^1H-NMR Spectra in λ-(BEDT-TSF)_2FeCl_4"J. Phys. Soc. Jpn.. (印刷中). (2002)

S.Endo 等人：“λ-(BEDT-TSF)_2FeCl_4 中的 ^1H-NMR 谱的异常分裂”J. Phys Jpn.（出版中）。

N.Toyota, H.Matsui, et al.: "Norlinear electrical transport in λ-(BEDT-TSF)_2FeCI_4"Phys.Rev.B. 66. 033201 (2002)

N.Toyota、H.Matsui 等人：“λ-(BEDT-TSF)_2FeCI_4 中的非线性电传输”Phys.Rev.B. 66. 033201 (2002)

豊田直樹, 松井広志: "準二次元導態λ-(BEDT-TSF)_2FeCI_4における異常金属状態"日本物理学会誌. 57・8. 575-580 (2002)

丰田直树、松井浩：“准二维传导中的反常金属态 λ-(BEDT-TSF)_2FeCI_4”日本物理学会杂志 57・8 (2002)。

H.Matsui, et al.: "Dielectric Response in the Metallic States of λ-(BEDT-TSF)_2FeCl_4"Synth. Metal. (印刷中). (2002)

H.Matsui 等人：“λ-(BEDT-TSF)_2FeCl_4 的金属态介电响应”合成金属（2002 年）。