Study of Heavy Fermions in Ce - and U-Compounds by Low-Temperature Specific Heat Measurements and Other Techniques

通过低温比热测量和其他技术研究 Ce 和 U 化合物中的重费米子

• 批准号: 61460037
• 负责人: FUJITA Toshizo
• 金额: $ 4.1万
• 依托单位: HIROSHIMA 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: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460037/
• 关键词: Specific heat; Ce-compound; Dense-Kondo effect; 重いフェルミオン系; セリウム化合物

Technically, we built a cryostat, which can cover a wide range of temperature from 0.02 K to 80 K, and a measuring system for specific heat in magnetic field up to 6 T. In addition, our measurements were extended to various transport properties including resistivity, thermoelectric power, etc.Specific heat was measured for a series of dilute-to-dense Kondo compounds Ce_xLa_<1-x>Cu_6. Overall features of magnetic contribution to the low temperature specific heat are quite similar irrespective of Ce-concentration x in Ce_xLa_<1-x>Cu_6. However, we found a profound difference in the low temperature specific heat under magnetic field between the dense and dilute systems, which can be atributed to the coherence of Kondo scattering.We discovered a new series of compounds CeMIn (M = Pd, Pt, Ni) and measured resistivity, susceptibility and specific heat for all of them. These systems exhibit a wide variety of behavior characteristic of Ce-compounds, including dense Kondo, antiferromagnetism, spin fluctuation and mixed-valent behavior.

在技术上，我们建立了一个可以覆盖0.02K到80K的宽温度范围的低温恒温器和一个高达6T的磁场比热测量系统，此外，我们的测量还扩展到了包括电阻率、温差电势等在内的各种输运性质。测量了一系列稀密Kondo化合物Ce_xLa_&lt；1-x&Gt；Cu6的比热。发现了一系列新的化合物Cmin(M=Pd，Pt，Ni)，并测量了它们的电阻率、磁化率和比热。这些体系表现出各种Ce化合物的行为特征，包括致密的Kondo、反铁磁性、自旋涨落和混价行为。

项目成果

Y. Maeno, M. Takahashi, T. Fujita, Y. Uwatoko, H. Fujii and T. Okamoto: "Specific Heat of a New Dense-Kondo Compound CePdIn" Japanese Journal of Applied Physics. 26. (1987)

Y. Maeno、M. Takahashi、T. Fujita、Y. Uwatoko、H. Fujii 和 T. Okamoto：“新型致密近藤化合物 CePdIn 的比热”《日本应用物理学杂志》。

K. Satoh: "Dependence of Specific Heat of Ce_xLa_<1-x>Cu_6" Journal of Science of the Hiroshima University Series A (Phys. and Chem.). 52. (1988)

K. Satoh：“Ce_xLa_<1-x>Cu_6 比热的依赖性”广岛大学科学杂志 A 系列（物理和化学）。

M. Kato, K. Satoh, Y. Maeno, Y. Aoki, T. Fujita, Y. Onuki and T. Komatsubara: "Specific Heat fo Dense-Kondo System Ce_xLa_<1-x>Du_6" Journal of Physical Society of Japan. 56. 3661-3666 (1987)

M. Kato、K. Satoh、Y. Maeno、Y. Aoki、T. Fujita、Y. Onuki 和 T. Komatsubara：“密集近藤系统的比热 Ce_xLa_<1-x>Du_6” 日本物理学会杂志

M. Kurisu, H. Kadomatsu, H. Fujiwara, T. Ohyama, J. Sakurai and Y. Komura: "Transport Properties of LaG_<1-x>In_x, CeAg_<1-x>In_x and RAg (R=R, Nd, Gd and Y)" Journal of Physical Society of Japan. 56. 3240-3247 (1987)

M. Kurisu、H. Kadomatsu、H. Fujiwara、T. Ohyama、J. Sakurai 和 Y. Komura：“LaG_<1-x>In_x、CeAg_<1-x>In_x 和 RAg 的输运特性（R=R，

J. Sakurai: Journal of Magnetism and Magnetic Materials. 70. 381-382 (1987)

J. Sakurai：《磁性与磁性材料杂志》。