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.

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.对于CE_XLA__ <1-X> CU_6中的CE-浓度X，对低温比热的磁贡献的总体特征是非常相似的。然而，我们发现密集和稀释系统之间的磁场下的低温特异性热量有很大的差异，这可以归因于Kondo散射的连贯性。我们发现了一系列新的化合物Cemin（M = PD，PT，NI），并测量的电阻率，易感性，易感性和所有它们的特定热量。这些系统表现出CE化合物的各种行为特征，包括密集的杂种，抗磁力，自旋波动和混合价值行为。

项目成果

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）。

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》。

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，

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

H. Fujii, Y. Uwatoko, M. Akayama, K. Satoh, Y. Maeno, T. Fujita et al.: "Magnetic and Transport Properties of New Kondo Compounds CeTIn (T=Ni,Pd and Pt)" Japanese Journal of Applied Physics. 26. (1987)

H. Fujii、Y. Uwatoko、M. Akayama、K. Satoh、Y. Maeno、T. Fujita 等人：“新型近藤化合物 CeTIn（T=Ni、Pd 和 Pt）的磁性和输运特性” 日本期刊