NMR Study of Uranium Ternary Compounds with a Weak Magnetic Interaction

弱磁相互作用铀三元化合物的核磁共振研究

• 批准号: 04640342
• 负责人: KOJIMA Kenichi
• 金额: $ 1.28万
• 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 (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640342/
• 关键词: Actinide compound; Uranium compound; ternary compound; Heavy electron state; NMR; 三元系物質; ナイトシフト

In order to investigate interesting physical phenomena such as the Kondo effect and heavy fermion behavior for uranium ternary compounds, we have searched the uranium ternary compounds with a weak magnetic interaction and have studied them microscopically with NMR.Prof.Takabatake, and investigator, has synthesized new U-T-Ga compounds (T=Ni, Cu and Pd). In these compounds UCu_<3+x>Ga_<2-x> (0.1*x*0.8) shows a maximum T_N(x) near x=0.3 and a nonmagnetic heavy-fermion state with further increase in x.Prof.Kojima, the head investigator, has performed NMR measurement for UPt_2Sn and U_3Pt_3Sn_4. The ^<119>Sn NMR is observable down to 4.2 K in spite of disappearance of the ^<195>Pt NMR below T_N=60K.This suggests a spin structure which results in a cancellation of the transferred hyperfine fields at a Sn site. ^<195>Pt and ^<119>Sn Knight shifts in U_3Pt_3Sn_4 have been measured down to 4.2 K and temperature variations of the Knight shift saturate near 4.2 K.This results suggest that the 5f electron state is delocalized in this temperature range.

In order to investigate interesting physical phenomena such as the Kondo effect and heavy fermion behavior for uranium ternary compounds, we have searched the uranium ternary compounds with a weak magnetic interaction and have studied them microscopically with NMR.Prof.Takabatake, and investigator, has synthesized new U-T-Ga compounds (T=Ni, Cu and Pd).在这些化合物中，ucu_ <3+x> ga__ <2-x>（0.1*x*0.8）显示了x = 0.3附近的最大t_n（x）和一个非磁性的重毛力状态，并进一步增加了x.prof.kojima，负责人研究员已进行了upt_2sn and u_3ppt_3sn和u_3ppt的NMR测量值。尽管 ^<195> pt nmr在t_n = 60k以下的 ^<195> pt nmr消失，但 ^<119> Sn nmr可观察到4.2 k。这表明一种旋转结构导致取消了SN位置上传递的超精细领域的旋转结构。 ^<195> pt and ^<119> u_3pt_3sn_4中的sn骑士移位已被测量至4.2 k，骑士移位的温度变化接近4.2 k。这表明5F电子状态在此温度范围内被定位。

项目成果

K.Kojima: "NMR study of UPt_2Sn" Physica B. (1993)

K.Kojima：“UPt_2Sn 的核磁共振研究”Physica B. (1993)

T.Takabatake: "Structural and Physical Properties of New U-T-Ga Compounds(T=Ni,Cu and Pt)" Physica B. 186-188. 734-737 (1993)

T.Takabatake：“新型 U-T-Ga 化合物（T=Ni、Cu 和 Pt）的结构和物理性质”Physica B. 186-188。

T.Takabatake et al.: "Structural and Physical Properties of New U-T-Ga Compounds(T=Ni, Cu and Pt)" Physica. B, 186-188. 734-737 (1993)

T.Takabatake 等人：“新型 U-T-Ga 化合物（T=Ni、Cu 和 Pt）的结构和物理性质”物理学。

K.Kojima: "NMR Study of UPt_2Sn" Physica B. 186-188. 691-693 (1993)

K.Kojima：“UPt_2Sn 的核磁共振研究”Physica B.186-188。

K.Kojima et al.: "NMR Study on UPt_2Sn" Physica. B, 186-188. 691-693 (1993)

K.Kojima 等人：“UPt_2Sn 的 NMR 研究”物理学。